U.S. strategic nuclear forces: background, developments, and issues.
During discussions about the 2010 Nuclear Posture Review, Congress reviewed and discussed the plans for maintaining and modernizing U.S. strategic nuclear forces. Although the United States plans to reduce the number of warheads deployed on its long-range missiles and bombers, consistent with the terms of the New START Treaty, it also plans to develop new delivery systems for deployment over the next 20-30 years. As a result, the 112th Congress will continue to review these programs during the annual authorization and appropriations process.
During the Cold War, the U.S. nuclear arsenal contained many types of delivery vehicles for nuclear weapons. The longer-range systems, which included long-range missiles based on U.S. territory, long-range missiles based on submarines, and heavy bombers that could threaten Soviet targets from their bases in the United States, are known as strategic nuclear delivery vehicles. At the end of the Cold War, in 1991, the United States deployed more than 10,000 warheads on these delivery vehicles. That number has declined to less than 6,000 warheads today, and is slated to decline to 1,550 warheads by the year 2017 if the New START Treaty enters into force.
At the present time, the U.S. land-based ballistic missile force (ICBMs) consists of 450 Minuteman III ICBMs, each deployed with between one and three warheads; they will all be reduced to only one warhead over the next few years. The Air Force has deactivated all 50 of the 10-warhead Peacekeeper ICBMs and 50 Minuteman III missiles. The Air Force is also modernizing the Minuteman missiles, replacing and upgrading their rocket motors, guidance systems, and other components. The Air Force had expected to begin replacing the Minuteman missiles around 2018, but has decided, instead, to continue to modernize and maintain the existing missiles, so that they can remain in the force through 2030.
The U.S. ballistic missile submarine fleet currently consists of 14 Trident submarines; each carries 24 Trident II (D-5) missiles. The Navy converted 4 of the original 18 Trident submarines to carry non-nuclear cruise missiles. The remaining submarines currently carry around 1,200 warheads in total; that number will decline as the United States implements the New START Treaty. The Navy has shifted the basing of the submarines, so that nine are deployed in the Pacific Ocean and five are in the Atlantic, to better cover targets in and around Asia. It also has undertaken efforts to extend the life of the missiles and warheads so that they and the submarines can remain in the fleet past 2020, and to begin design work on a new submarine.
The U.S. fleet of heavy bombers includes 19 B-2 bombers and 94 B-52 bombers. The B-1 bomber is no longer equipped for nuclear missions. The fleet will decline to around 60 aircraft in coming years, as the United States implements New START. The Air Force has also begun to retire the nuclear-armed cruise missiles carried by B-52 bombers, leaving only about half the B-52 fleet equipped to carry nuclear weapons. The Air Force plans to procure both a new long-range bomber and a new cruise missile over the next 20 years.
The Obama Administration recently completed a review of the size and structure of the U.S. nuclear force as a part of the congressionally mandated Nuclear Posture Review. It has also recently signed a New START Treaty with Russia that will limit the number of deployed missiles and warheads in the U.S. strategic force. Congress will review the Administration's plans for U.S. strategic nuclear forces during the annual authorization and appropriations process, and if it assesses the terms of a prospective nuclear arms control treaty with Russia. This report will be updated as needed.
Contents Introduction Background: The Strategic Triad Force Structure and Size During the Cold War Force Structure and Size After the Cold War Current and Future Force Structure and Size Strategic Nuclear Delivery Vehicles: Recent Plans and Current Modernization Programs Intercontinental Ballistic Missiles (ICBMs) Peacekeeper (MX) Minuteman III Minuteman Modernization Programs Future Programs Submarine Launched Ballistic Missiles The SSGN Program The Backfit Program Basing Changes Warhead Issues Modernization Plans and Programs Future Programs Bombers B-1 Bomber B-2 Bomber B-52 Bomber Future Bomber Plans Issues for Congress Force Size Force Structure Safety, Security, and Management Issues Figures Figure 1. U.S. Strategic Nuclear Weapons: 1960-1990 Figure 2. U.S. Strategic Nuclear Forces: 1990-2009 Tables Table 1. U.S. Strategic Nuclear Forces Under START I and START II Table 2. U.S. Strategic Nuclear Forces under New START Contacts Author Contact Information
During the Cold War, the U.S. nuclear arsenal contained many types of delivery vehicles for nuclear weapons, including short-range missiles and artillery for use on the battlefield, medium-range missiles and aircraft that could strike targets beyond the theater of battle, short- and medium-range systems based on surface ships, long-range missiles based on U.S. territory and submarines, and heavy bombers that could threaten Soviet targets from their bases in the United States. The short- and medium-range systems are considered non-strategic nuclear weapons and have been referred to as battlefield, tactical, and theater nuclear weapons. (1) The long-range missiles and heavy bombers are known as strategic nuclear delivery vehicles.
In 1990, as the Cold War was drawing to a close and the Soviet Union was entering its final year, the United States had more than 12,000 nuclear warheads deployed on 1,875 strategic nuclear delivery vehicles. (2) As of July 1, 2009, according to the counting rules in the Strategic Arms Reduction Treaty (START), the United States had reduced to 5,916 nuclear warheads on 1,188 strategic nuclear delivery vehicles. (3) Under the terms of the 2002 Strategic Offensive Reduction Treaty (known as the Moscow Treaty) between the United States and Russia, this number was to decline to no more than 2,200 operationally deployed strategic nuclear warheads by the end of 2012. The State Department has reported that the United States has already reached that level, with only 1,968 operationally deployed strategic warheads in December 2009. (4) The New START Treaty, signed by President Obama and President Medvedev on April 8, 2010, reduces those forces further, to no more than 1,550 warheads on deployed launchers and heavy bombers. (5)
Although these numbers do not count the same categories of nuclear weapons, they indicate that the number of deployed warheads on U.S. strategic nuclear forces has declined significantly in the two decades following the end of the Cold War. Yet, nuclear weapons continue to play a key role in U.S. national security strategy, and the United States does not, at this time, plan to either eliminate its nuclear weapons or abandon the strategy of nuclear deterrence that has served as a core concept in U.S. national security strategy for more than 60 years. In a speech in Prague on April 5, 2009, President Obama highlighted "America's commitment to seek the peace and security of a world without nuclear weapons." But he recognized that this goal would not be reached quickly, and probably not in his lifetime. (6) And, even though the President pledged to reduce the roles and numbers of U.S. nuclear forces, the 2010 Nuclear Posture Review noted that "the fundamental role of U.S. nuclear weapons, which will continue as long as nuclear weapons exist, is to deter nuclear attack on the United States, our allies, and partners." (7) Moreover, in the NPR and in the documents released with the FY2011 budget, the Administration has indicated that the United States is planning to pursue programs that will allow it to modernize and adjust its strategic forces so that they remain capable in coming years.
This report reviews the ongoing programs that will affect the expected size and shape of the U.S. strategic nuclear force structure. It begins with an overview of this force structure during the Cold War, and summarizes the reductions and changes that have occurred since 1991. It then offers details about each category of delivery vehicle--land-based intercontinental ballistic missiles (ICBMs), submarine launched ballistic missiles (SLBMs) and heavy bombers--focusing on their current deployments and ongoing and planned modernization programs. The report concludes with a discussion of issues related to decisions about the future size and shape of the U.S. strategic nuclear force.
Background: The Strategic Triad
Force Structure and Size During the Cold War
Since the early 1960s the United States has maintained a "triad" of strategic nuclear delivery vehicles. The United States first developed these three types of nuclear delivery vehicles, in large part, because each of the military services wanted to play a role in the U.S. nuclear arsenal. However, during the 1960s and 1970s, analysts developed a more reasoned rationale for the nuclear "triad." They argued that these different basing modes had complementary strengths and weaknesses. They would enhance deterrence and discourage a Soviet first strike because they complicated Soviet attack planning and ensured the survivability of a significant portion of the U.S. force in the event of a Soviet first strike. (8) The different characteristics might also strengthen the credibility of U.S. targeting strategy. For example, ICBMs eventually had the accuracy and prompt responsiveness needed to attack hardened targets such as Soviet command posts and ICBM silos, SLBMs had the survivability needed to complicate Soviet efforts to launch a disarming first strike and to retaliate if such an attack were attempted, (9) and heavy bombers could be dispersed quickly and launched to enhance their survivability, and they could be recalled to their bases if a crisis did not escalate into conflict.
According to unclassified estimates, the number of delivery vehicles (ICBMs, SLBMs, and nuclear-capable bombers) in the U.S. force structure grew steadily through the mid-1960s, with the greatest number of delivery vehicles, 2,268, deployed in 1967. (10) The number then held relatively steady through 1990, at between 1,875 and 2,200 ICBMs, SLBMs, and heavy bombers. The number of warheads carried on these delivery vehicles increased sharply through 1975, then, after a brief pause, again rose sharply in the early 1980s, peaking at around 13,600 warheads in 1987. Figure 1 displays the increases in delivery vehicles and warheads between 1960, when the United States first began to deploy ICBMs, and 1990, the year before the United States and Soviet Union signed the Strategic Arms Reduction Treaty (START).
[FIGURE 1 OMITTED]
The sharp increase in warheads in the early 1970s reflects the deployment of ICBMs and SLBMs with multiple warheads, known as MIRVs (multiple independent reentry vehicles). In particular, the United States began to deploy the Minuteman III ICBM, with 3 warheads on each missile, in 1970, and the Poseidon SLBM, which could carry 10 warheads on each missile, in 1971. (11) The increase in warheads in the mid-1980s reflects the deployment of the Peacekeeper (MX) ICBM, which carried 10 warheads on each missile.
In 1990, before it concluded the original START Treaty, the United States deployed a total of around 12,304 warheads on its ICBMs, SLBMs, and heavy bombers. The ICBM force consisted of single-warhead Minuteman II missiles, 3-warhead Minuteman III missiles, and 10-warhead Peacekeeper (MX) missiles, for a total force of 2,450 warheads on 1,000 missiles. The submarine force included Poseidon submarines with Poseidon C-3 and Trident I (C-4) missiles, and the newer Trident submarines with Trident I, and some Trident II (D-5) missiles. The total force consisted of 5,216 warheads on around 600 missiles. (12) The bomber force centered on 94 B-52H bombers and 96 B-1 bombers, along with many of the older B-52G bombers and 2 of the new (at the time) B-2 bombers. This force of 260 bombers could carry over 4,648 weapons.
Force Structure and Size After the Cold War
During the 1990s, the United States reduced the numbers and types of weapons in its strategic nuclear arsenal, both as a part of its modernization process and in response to the limits in the 1991 START Treaty. The United States continued to maintain a triad of strategic nuclear forces, however, with warheads deployed on ICBMs, SLBMs, and bombers. According to the Department of Defense, this mix of forces not only offered the United States a range of capabilities and flexibility in nuclear planning and complicated an adversary's attack planning, but also hedged against unexpected problems in any single delivery system. This latter issue became more of a concern in this time period, as the United States retired many of the different types of warheads and missiles that it had deployed over the years, reducing the redundancy in its force.
The 1991 START Treaty limited the United States to a maximum of 6,000 total warheads, and 4,900 warheads on ballistic missiles, deployed on up to 1,600 strategic offensive delivery vehicles. However, the treaty did not count the actual number of warheads deployed on each type of ballistic missile or bomber. Instead, it used "counting rules" to determine how many warheads would count against the treaty's limits. For ICBMs and SLBMs, this number usually equaled the actual number of warheads deployed on the missile. Bombers, however, used a different system. Bombers that were not equipped to carry air-launched cruise missiles (the B-1 and B-2 bombers) counted as one warhead; bombers equipped to carry air-launched cruise missiles (B-52 bombers) could carry 20 missiles, but would only count as 10 warheads against the treaty limits. These rules have led to differing estimates of the numbers of warheads on U.S. strategic nuclear forces during the 1990s; some estimates count only those warheads that count against the treaty while others count all the warheads that could be carried by the deployed delivery systems.
[FIGURE 2 OMITTED]
According to the data from the Natural Resources Defense Council, the United States reduced its nuclear weapons from 9,300 warheads on 1,239 delivery vehicles in 1991 to 6,196 warheads on 1,064 delivery vehicles when it completed the implementation of START in 2001. By 2009, the United States had reduced its forces to approximately 2,200 warheads on around 850 delivery vehicles. According to the State Department, as of December 2009, the United States had 1,968 operationally deployed warheads on its strategic offensive nuclear forces. (13) These numbers appear in Figure 2.
During the 1990s, the United States continued to add to its Trident fleet, reaching a total of 18 submarines. It retired all of its remaining Poseidon submarines and all of the single-warhead Minuteman II missiles. It continued to deploy B-2 bombers, reaching a total of 21, and removed some of the older B-52G bombers from the nuclear fleet. Consequently, in 2001, its warheads were deployed on 18 Trident submarines with 24 missiles on each submarine and 6 or 8 warheads on each missile; 500 Minuteman III ICBMs, with one or 3 warheads on each missile; 50 Peacekeeper (MX) missiles, with 10 warheads on each missile; 94 B-52H bombers, with up to 20 cruise missiles on each bomber; and 21 B-2 bombers with up to 16 bombs on each aircraft.
The United States and Russia signed a second START Treaty in early 1993. Under this treaty, the United States would have had to reduce its strategic offensive nuclear weapons to between 3,000 and 3,500 accountable warheads. In 1994, the Department of Defense decided that, to meet this limit, it would deploy a force of 500 Minuteman III ICBMs with one warhead on each missile, 14 Trident submarines with 24 missiles on each submarine and 5 warheads on each missile, 76 B-52 bombers, and 21 B-2 bombers. The Air Force was to eliminate 50 Peacekeeper ICBMs and reorient the B-1 bombers to non-nuclear missions; the Navy would retire 4 Trident submarines (it later decided to convert these submarines to carry conventional weapons).
This treaty never entered into force, and Congress prevented the Clinton Administration from reducing U.S. forces unilaterally to START II limits. Nevertheless, the Navy and Air Force continued to plan for the forces described above, and eventually implemented those changes. Table 1 displays the forces the United States had deployed in 2001, after completing the START I reductions. It also includes those that it would have deployed under START II, in accordance the with 1994 decisions.
Current and Future Force Structure and Size
The Bush Administration stated in late 2001 that the United States would reduce its strategic nuclear forces to 1,700-2,200 "operationally deployed warheads" over the next decade. (14) This goal was codified in the 2002 Moscow Treaty. According to the Bush Administration, operationally deployed warheads were those deployed on missiles and stored near bombers on a day-to-day basis. They are the warheads that would be available immediately, or in a matter of days, to meet "immediate and unexpected contingencies." (15) The Administration also indicated that the United States would retain a triad of ICBMs, SLBMs, and heavy bombers for the foreseeable future. It did not, however, offer a rationale for this traditional "triad," although the points raised in the past about the differing and complementary capabilities of the systems probably still pertain. Admiral James Ellis, the former Commander of the U.S. Strategic Command (STRATCOM), highlighted this when he noted in a 2005 interview that the ICBM force provides responsiveness, the SLBM force provides survivability, and bombers provide flexibility and recall capability. (16)
The Bush Administration did not specify how it would reduce the U.S. arsenal from around 6,000 warheads to the lower level of 2,200 operationally deployed warheads, although it did identify some force structure changes that would account for part of the reductions. Specifically, after Congress removed its restrictions, (17) the United States eliminated the 50 Peacekeeper ICBMs, reducing by 500 the total number of operationally deployed ICBM warheads. It also continued with plans to remove 4 Trident submarines from service, and converted those ships to carry non-nuclear guided missiles. These submarines would have counted as 476 warheads under the START Treaty's rules. These changes reduced U.S. forces to around 5,000 warheads on 950 delivery vehicles in 2006; this reduction appears in Figure 2. The Bush Administration also noted that two of the Trident submarines remaining in the fleet would be in overhaul at any given time. The warheads that could be carried on those submarines would not count against the Moscow Treaty limits because they would not be "operationally deployed." This would further reduce the U.S. deployed force by 200-400 warheads.
The Bush Administration, through the 2005 Strategic Capabilities Assessment and 2006 Quadrennial Defense Review, announced additional changes in U.S. ICBMs, SLBMs, and bomber forces; these included the elimination of 50 Minuteman III missiles and several hundred air-launched cruise missiles. (These are discussed in more detail below.) These changes appeared to be sufficient to reduce the number of operationally deployed warheads enough to meet the treaty limit of 2,200 warheads, as the United States announced, in mid-2009, that it has met this limit. Reaching this level, however, also depends on the number of warheads carried by each of the remaining Trident and Minuteman missiles. (18)
The Obama Administration also indicated, in the 2010 NPR, that the United States will retain a triad of ICBMs, SLBMs, and heavy bombers as the United States reduces its forces to the limits in the New START Treaty. The NPR indicated that the unique characteristics of each leg of the triad were important to the goal of maintaining strategic stability at reduced numbers of warheads:
Each leg of the Triad has advantages that warrant retaining all three legs at this stage of reductions. Strategic nuclear submarines (SSBNs) and the SLBMs they carry represent the most survivable leg of the U.S. nuclear Triad.... Single- warhead ICBMs contribute to stability, and like SLBMs are not vulnerable to air defenses. Unlike ICBMs and SLBMs, bombers can be visibly deployed forward, as a signal in crisis to strengthen deterrence of potential adversaries and assurance of allies and partners. (19)
Moreover, the NPR noted that "retaining sufficient force structure in each leg to allow the ability to hedge effectively by shifting weight from one Triad leg to another if necessary due to unexpected technological problems or operational vulnerabilities." (20)
Table 2 identifies a potential force structure that the United States might deploy under the New START Treaty, and compares it with estimates of U.S. operational strategic nuclear forces in 2010. This force structure is consistent with the statements and adjustments the Administration has made about deploying all Minuteman III missiles with a single warhead, retaining Trident submarines deployed in two oceans, and converting some number of heavy bombers to conventional-only missions. It is also consistent with the information the Administration provided to Congress in the 1251 report that it submitted along with the New START Treaty to the Senate in May 2010. (21)
Strategic Nuclear Delivery Vehicles: Recent Plans and Current Modernization Programs
Intercontinental Ballistic Missiles (ICBMs)
In the late 1980s, the United States deployed 50 Peacekeeper ICBMs, each with 10 warheads, at silos that had held Minuteman missiles at F.E. Warren Air Force Base in Wyoming. The 1993 START II Treaty would have banned multiple warhead ICBMs, so the United States would have had to eliminate these missiles while implementing the treaty. Therefore, the Pentagon began planning for their elimination, and the Air Force added funds to its budget for this purpose in 1994. However, beginning in FY1998, Congress prohibited the Clinton Administration from spending any money on the deactivation or retirement of these missiles until START II entered into force. The Bush Administration requested $14 million in FY2002 to begin the missiles' retirement; Congress lifted the restriction and authorized the funding. The Air Force began to deactivate the missiles in October 2002, and completed the process, having removed all the missiles from their silos, in September 2005. The MK21 reentry vehicles and W87 warheads from these missiles have been placed in storage. As is noted below, the Air Force plans to redeploy some of these warheads and reentry vehicles on Minuteman III missiles, under the Safety Enhanced Reentry Vehicle (SERV) program.
Under the terms of the original START Treaty, the United States would have had to eliminate the Peacekeeper missile silos to remove the warheads on the missiles from accountability under the treaty limits. However, the Air Force has chosen to retain the silos. Therefore, the warheads that were deployed on the Peacekeeper missiles still counted under START, even though the missiles were no longer operational, until START expired in December 2009. The United States does not, however, count any of these warheads under the limits in the Moscow Treaty. They also will not count under the limits in the New START Treaty, if the United States eliminates the silos. It will not, however, have to blow up or excavate the silos, as it would have had to do under the original START Treaty. The new START Treaty indicates that the parties can use whatever method they choose to eliminate the silos, as long as they demonstrate that the silos can no longer launch missiles.
The U.S. force of Minuteman III ICBMs has declined recently from 500 to 450 missiles. These missiles are located at three Air Force bases--F.E. Warren AFB in Wyoming, Malmstrom AFB in Montana, and Minot AFB in North Dakota. Each base houses 150 missiles.
In the 2006 Quadrennial Defense Review (QDR), the Pentagon indicated that it planned to "reduce the number of deployed Minuteman III ballistic missiles from 500 to 450, beginning in Fiscal Year 2007." (22) The QDR did not indicate which base was likely to lose a squadron of missiles, although, in testimony before the Senate Armed Services Committee, General James E. Cartwright, the Commander of U.S. Strategic Command (STRATCOM), indicated that the missiles would likely come from Malmstrom because that would leave each base with an equal number of 150 ICBMs. (23) The Air Force deactivated the missiles in Malmstrom's 564th Missile Squadron, which was known as the "odd squad." (24) This designation reflected that the launch control facilities for these missiles were built and installed by General Electric, while all other Minuteman launch control facilities were built by Boeing; as a result, these missiles used a different communications and launch control system than all the other Minuteman missiles. According to Air Force Space Command, the drawdown began on July 1, 2007. All of the reentry vehicles were removed from the missiles in early 2008, the missiles were all removed from their silos by the end of July 2008, and the squadron was deactivated by the end of August 2008. (25)
In testimony before the Senate Armed Services Committee, General Cartwright stated that the Air Force had decided to retire these missiles so that they could serve as test assets for the remaining force. He noted that the Air Force had to "keep a robust test program all the way through the life of the program." (26) With the test assets available before this decision, the test program would begin to run short around 2017 or 2018. The added test assets would support the program through 2025 or longer. This time line, however, raises questions about why the Air Force pressed to begin retiring the missiles in FY2007, 10 years before it runs out of test assets. Some have speculated that the elimination of the 50 missiles was intended to reduce the long-term operations and maintenance costs for the fleet, particularly since the 564th Squadron used different ground control technologies and training systems than the remainder of the fleet. This option was not likely, however, to produce budgetary savings in the near term as the added cost of deactivating the missiles could exceed the reductions in operations and maintenance expenses. (27) In addition, to use these missiles as test assets, the Air Force will include them in the modernization programs described below. This would further limit the budgetary savings. At the same time, the Air Force plans to retain the silos at Malmstrom, and will not destroy or eliminate them.
Retiring these missiles might also allow the Air Force to reduce the number of officers needed to operate the Minuteman fleet and to transfer these officers to different positions, although, again, the numbers are likely to be small. Nevertheless, by retiring these missiles, both STRATCOM and the Air Force can participate in the ongoing effort to transform the Pentagon in response to post-Cold War threats. These missiles may still have a role to play in U.S. national security strategy, but they may not be needed in the numbers that were required when the United States faced the Soviet threat.
Congress questioned the Administration's rationale for this plan to retire 50 Minuteman missiles. In the FY2007 Defense Authorization Act (H.R. 5122, [section]139), Congress stated that DOD could not spend any money to begin the withdrawal of these missiles from the active force until the Secretary of Defense submitted a report that addressed a number of issues, including (1) a detailed justification for the proposal to reduce the force from 500 to 450 missiles; (2) a detailed analysis of the strategic ramifications of continuing to equip a portion of the force with multiple independent warheads rather than single warheads; (3) an assessment of the test assets and spares required to maintain a force of 500 missiles and a force of 450 missiles through 2030; (4) an assessment of whether halting upgrades to the missiles withdrawn from the deployed force would compromise their ability to serve as test assets; and (5) a description of the plan for extending the life of the Minuteman III missile force beyond FY2030. The Secretary of Defense submitted this report to Congress in late March 2007.
The Obama Administration has indicated that it plans to retain up to 420 Minuteman III ICBMs under the New START Treaty. Even though this would require the elimination of 30 ICBM silos, under the New START Treaty, the United States can eliminate these silos without physically destroying them. Moreover, under New START, the United States may keep all three of its ICBM bases, but reduce its force by eliminating 10 launchers at each base.
Each Minuteman III missile was initially deployed with 3 warheads, for a total of 1,500 warheads across the force. In 2001, to meet the START limit of 6,000 warheads, the United States removed 2 warheads from each of the 150 Minuteman missiles at F.E. Warren AFB, (28) reducing the Minuteman III force to 1,200 total warheads. In the process, the Air Force also removed and destroyed the "bulkhead," the platform on the reentry vehicle, so that, in accordance with START rules, these missiles can no longer carry 3 warheads.
Under START II, the United States would have had to download all the Minuteman III missiles to one warhead each. Although the Bush Administration initially endorsed the plan to download all Minuteman ICBMs, this plan apparently changed. In an interview with Air Force Magazine in October 2003, General Robert Smolen indicated that the Air Force would maintain the ability to deploy these 500 missiles with up to 800 warheads. (29) Although some analysts interpreted this statement to mean that the Minuteman ICBMs would carry 800 warheads on a day-to-day basis, it seems more likely that this was a reference to the Air Force intent to maintain the ability to reload warheads, and reconstitute the force, if circumstances changed. (30) The 2001 NPR had indicated that the United States would maintain the flexibility to do this. However, in testimony before the Senate Armed Services Committee, General Cartwright also indicated that some Minuteman missiles might carry more than one warhead. Specifically, when discussing the reduction from 500 to 450 missiles, he said, "this is not a reduction in the number of warheads deployed. They will just merely be re-distributed on the missiles." (31) Major General Deppe confirmed that the Air Force would retain some Minuteman III missiles with more than one warhead when he noted, in a speech in mid-April 2007, that the remaining 450 Minuteman III missiles could be deployed with one, two, or three warheads. (32)
In the 2010 NPR, the Obama Administration indicated that, under the New START Treaty, all of the U.S. Minuteman III missiles will carry only one warhead. It indicated that this configuration would "enhance the stability of the nuclear balance by reducing incentives for either side to strike first." (33) However, unlike under START, the United States will not have to alter the front end of the missile or remove the old bulkhead. As a result, the United States could restore warheads to its ICBM force if the international security environment changed.
Minuteman Modernization Programs
The Air Force has pursued several programs that are designed to improve the accuracy and reliability of the Minuteman fleet and to extend the missiles' service lives. According to some estimates, this effort could eventually cost $6 billion-$7 billion. (34) This section describes several of the key programs in this effort.
Propulsion Replacement Program (PRP)
The program began in 1998 and has been replacing the propellant, the solid rocket fuel, in the Minuteman motors to extend the life of the rocket motors. A consortium led by Northrup Grumman poured the new fuel into the first and second stages and remanufactured the third stages of the missiles. According to the Air Force, as of early August, 2007, 325 missiles, or 72% of the fleet, had completed the PRP program; this number increased to around 80% by mid-2008. The Air Force purchased the final 56 booster sets, for a total of 601, with its funding in FY2008. Funding in FY2009 supported the assembly of the remaining boosters. The Air Force expects to complete the PRP program by 2013. (35) In the FY2007 Defense Authorization Act (P.L. 109-364) and the FY2007 Defense Appropriations Act (P.L. 109-289), the 109th Congress indicated that it would not support efforts to end this program early. However, in its budget request for FY2010, the Air Force indicated that FY2009 was the last year for funding for the program.
Guidance Replacement Program (GRP)
The Guidance Replacement Program has extended the service life of the Minuteman missiles' guidance set, and improved the maintainability and reliability of guidance sets. It replaced aging parts with more modern and reliable technologies, while maintaining the accuracy of the missiles. (36) Flight testing for the new system began in 1998, and, at the time, it exceeded its operational requirements. Production began in 2000, and the Air Force purchased 652 of the new guidance units. Press reports indicate that the system had some problems with accuracy during its testing program. (37) The Air Force eventually identified and corrected the problems in 2002 and 2003. According to the Air Force, 425 Minuteman III missiles were upgraded with the new guidance packages as of early August, 2007. The Air Force had been taking delivery of 5-7 new guidance units each month, for a total of 652 units. Boeing reported that it had delivered the final guidance set in early February 2009. The Air Force did not request any additional funding for this program in FY2010. However, it did request $1.2 million in FY2011 and $0.6 million in FY2012 to complete the program.
Propulsion System Rocket Engine Program (PSRE)
According to the Air Force, the Propulsion System Rocket Engine (PSRE) program is designed to rebuild and replace Minuteman post-boost propulsion system components that were produced in the 1970s. The Air Force has been replacing, rather than repairing this system because original replacement parts, materials, and components are no longer available. This program is designed to reduce the life-cycle costs of the Minuteman missiles and maintain their reliability through 2020. The Air Force plans to purchase a total of 574 units for this program. Through FY2009, the Air Force had purchased 441 units, at a cost of $128 million. It requested an additional 26.2 million to purchase another 96 units in FY2010 and $21.5 million to purchase 37 units in FY2011. This would complete the purchase of the units. As a result, the budget for FY2012 does not support the purchase of any additional units, but does include $26.1 million for continuing work installing the units.
Rapid Execution and Combat Targeting (REACT) Service Life Extension Program
The REACT targeting system was first installed in Minuteman launch control centers in the mid-1990s. This technology allowed for a significant reduction in the amount of time it would take to re-target the missiles, automated routine functions to reduce the workload for the crews, and replaced obsolete equipment. (38) In 2006, the Air Force began to deploy a modernized version of this system to extend its service life and to update the command and control capability of the launch control centers. This program will allow for more rapid retargeting of ICBMs, a capability identified in the Nuclear Posture Review as essential to the future nuclear force The Air Force completed this effort in late 2006.
Safety Enhanced Reentry Vehicle (SERV)
As was noted above, under the SERV program, the Air Force plans to deploy MK21/W-87 reentry vehicles removed from Peacekeeper ICBMs on the Minuteman missiles, replacing the older MK12/W62 and MK12A/W78 reentry vehicles. To do this, the Air Force must modify the software, change the mounting on the missile, and change the support equipment. According to Air Force Space Command, the SERV program conducted three flight tests in 2005 and cancelled a fourth test because the first three were so successful. (39) The Air Force installed 20 of the kits for the new reentry vehicles on the Minuteman missiles at F.E. Warren Air Force Base in 2006. The process began at Malmstrom in July 2007 and at Minot in July 2008. As of early August 2007, 47 missiles had been modified. The Air Force purchase an additional 111 modification kits in FY2009, for a total of 570 kits. This was the last year that it planned to request funding for the program. It plans to complete the installation process by 2012.
This program will likely ensure the reliability and effectiveness of the Minuteman III missiles throughout their planned deployments. The W-87 warheads entered the U.S. arsenal in 1986 and were refurbished in 2005. This process extended their service life past 2025. (40)
Solid Rocket Motor Warm Line Program
In the FY2009 Omnibus Appropriations Bill, Congress approved a new program known as the Solid Rocket Motor Warm Line Program. According to Air Force budget documents, this program is intended to "sustain and maintain the unique manufacturing and engineering infrastructure necessary to preserve the Minuteman III solid rocket motor production capability" by providing funding to maintain a low rate of production of motors each year. (41) The program received $42.9 million in FY2010 and produced motors for four Minuteman ICBMs. DOD requested $44.2 million to produce motors for three additional ICBMs in FY2011. The budget request for FY2012 includes an additional $34 million to complete work on the motors purchased in prior years.
The Air Force began to explore its options for a new missile to replace the Minuteman III in 2002, with the intent to begin deploying a new missile in 2018. It reportedly produced a "mission needs statement" at that time, and then began an Analysis of Alternatives (AOA) in 2004. (42) In June 2006, General Frank Klotz indicated that, after completing the AOA, Space Command had decided to recommend "an evolutionary approach to the replacement of the Minuteman III capability," (43) which would continue to modernize the components of the existing missiles rather than begin from scratch to develop and produce new missiles. He indicated that Space Command supported this approach because it would be less costly than designing a new system "from scratch." With this plan in place, the Air Force began examining the investments that might be needed to sustain the Minuteman force through 2030. According to General Robert Kehler, the new Commander-in-Chief of STRATCOM, the missile should be viable throughout that time. (44)
At the same time, the Air Force has begun to consider what a follow-on system to the Minuteman III might look like for the time frame after 2030. The Air Force began a capabilities-based assessment of its land-based deterrent in early 2011 and will conduct a new Analysis of Alternatives (AOA) for the ICBM force between 2012 and 2014. (45) This review will recommend a specific "way forward" for an ICBM follow-on. According to the Air Force, it has requested $2.6 million to begin the study in the FY2012 budget and it plans to spend $26 million between FY2012 and FY2014. Initial research and development funding for this missile may appear in the FY2013 budget request, based on initial results from the AOA
Submarine Launched Ballistic Missiles
The U.S. fleet of ballistic missile submarines consists of 14 Trident submarines, each equipped to carry 24 Trident missiles. The fleet currently carries a total of around 1,200 warheads.
By the early 1990s, the United States had completed the deployment of 18 Trident ballistic missile submarines (SSBNs). Each of these submarines was equipped to carry 24 Trident missiles, and each missile could carry up to 8 warheads (either W-76 warheads or the larger W-88 warheads on the Trident II missile). The Navy initially deployed 8 of these submarines at Bangor, WA, and all 8 were equipped with the older Trident I missile. It then deployed 10 submarines, all equipped with the Trident II missile, at Kings Bay, GA. During the 1994 Nuclear Posture Review, the Clinton Administration decided that the United States would reduce the size of its Trident fleet to 14 submarines, and that four of the older submarines would be "backfit" to carry the Trident II missile.
The Bush Administration's 2001 Nuclear Posture Review endorsed the plan to "backfit" 4 of the Trident submarines so that all would carry Trident II missiles. It also indicated that, instead of retiring the remaining 4 submarines, the Navy would convert them to carry conventional weapons, and designated them "guided missile" submarines (SSGNs). The 2010 NPR also endorsed a force of 14 Trident submarines, although it noted that it might reduce that force to 12 submarines in the latter half of this decade. However, to meet the reductions mandated in New START, each submarine will deploy with only 20 missiles. The United States will remove key components from the other four launch tubes so that they can no longer launch missiles and so that they will not count under New START. As a result, the U.S. ballistic missile submarine (SSBN) force is likely to continue to consist of 14 Trident submarines, with 7 based at Bangor, WA, 5 based at Kings Bay, GA, and 2 in overhaul.
The SSGN Program
The Navy has completed the process of converting 4 Trident submarines (the USS Ohio, USS Michigan, USS Florida, and USS Georgia) to carry conventional cruise missiles and other conventional weapons. Reports indicate that the conversion process took approximately $1 billion and two years for each of the 4 submarines. The SSGNs can each carry 154 Tomahawk cruise missiles, along with up to 100 special forces troops and their mini-submarines. (46)
The first two submarines scheduled for this conversion were removed from the nuclear fleet in early 2003. They were slated to receive their engineering overhaul, then to begin the conversion process in 2004. (47) The first to complete the process, the USS Ohio returned to service as an SSGN in January 2006 (48) and achieved operational status on November 1, 2007. According to the Navy, the Georgia was scheduled for deployment in March 2008, and the other submarines were scheduled to reach that status later in the year. (49) According to Admiral Stephen Johnson, the Director of the Navy's Strategic Submarine Program (SSP), all four of the submarines had returned to service by mid-2008, and two were forward-deployed on routine patrols.
The Backfit Program
As was noted above, both the 1994 and 2001 Nuclear Posture Reviews confirmed that the Navy would "backfit" four Trident submarines so that they could carry the newer Trident II (D-5) missile. This process not only allowed the Navy to replace the aging C-4 missiles, it also equipped the fleet with a missile that has improved accuracy and a larger payload. With its greater range, it would allow the submarines to operate in a larger area and cover a greater range of targets. These characteristics were valued when the system was designed and the United States sought to enhance its ability to deter the Soviet Union. The Bush Administration believed that the range, payload, and flexibility of the Trident submarines and D-5 missiles remained relevant in an era when the United States may seek to deter or defeat a wider range of adversaries. The Obama Administration has emphasized that, by providing the United States with a secure second strike capability, these submarines enhance strategic stability.
Four of the eight Trident submarines based in Bangor, WA (USS Alaska, USS Nevada, USS Henry M. Jackson and USS Alabama) were a part of the backfit program. The Alaska and Nevada both began the process in 2001; the Alaska completed its backfit and rejoined the fleet in March 2002 and the Nevada did the same in August 2002. During the process, the submarines underwent a pre-planned engineered refueling overhaul, which accomplishes a number of maintenance objectives, including refueling of the reactor; repairing and upgrading some equipment, replacing obsolete equipments, repairing or upgrading the ballistic missile systems, and other minor alterations. (50) The submarines also are fit with the Trident II missiles and the operating systems that are unique to these missiles. According to the Navy, both of these efforts came in ahead of schedule and under budget. The Henry M. Jackson and Alabama were scheduled to compete their engineering overhaul and backfit in FY2006 and to reenter the fleet in 2007 and 2008.
The last of the Trident I (C-4) missiles was removed from the fleet in October 2004, when the USS Alabama off-loaded its missiles and began the overhaul and backfit process. All the Trident submarines currently in the U.S. fleet now carry the Trident II missile. (51)
When the Navy first decided, in the mid-1990s, to maintain a Trident fleet with 14 submarines, it planned to "balance" the fleet by deploying 7 Trident submarines at each of the two Trident bases. The Navy would have transferred 3 submarines from Kings Bay to Bangor, after 4 of the submarines from Bangor were removed from the ballistic missile fleet, for a balance of 7 submarines at each base. However, these plans changed after the Bush Administration's Nuclear Posture Review. The Navy has transferred 5 submarines to Bangor, "balancing" the fleet by basing 9 submarines at Bangor and 5 submarines at Kings Bay. Because two submarines would be in overhaul at any given time, this basing plan means that 7 submarines would be operational at Bangor and 5 would be operational at Kings Bay.
According to unclassified reports, the Navy began moving Trident submarines from Kings Bay to Bangor in 2002, and transferred the fifth submarine in September 2005. (52) This change in basing pattern apparently reflects changes in the international security environment, with fewer targets within range of submarines operating in the Atlantic, and a greater number of targets within range of submarines operating in the Pacific. In particular, the shift allows the United States to improve its coverage of targets in China and North Korea. (53) Further, as the United States modifies its nuclear targeting objectives it could alter the patrol routes for the submarines operating in both oceans, so that a greater number of emerging targets would be within range of the submarines in a short amount of time.
The Trident II (D-5) missiles can be equipped to carry up to 8 warheads each. Under the terms of the original START Treaty, the United States could remove warheads from Trident missiles, and reduce the number listed in the database, a process known as downloading, to comply with the treaty's limit of 6,000 warheads. The United States took advantage of this provision as it reduced its forces under START, reducing to 6 warheads per missile on the 8 Trident submarines based at Bangor, WA. (54)
The Navy has also reduced the number of warheads on the other Trident submarines, so that the United States could reduce its forces to the 2,200 deployed warheads permitted under the Moscow Treaty. The United States did not have to reach this limit until 2012, but it has already done so. The United States does not, however, have to indicate how many warheads are deployed on each missile; it can simply have to declare a total number of operationally deployed warheads on all of its strategic nuclear delivery vehicles. Moreover, the United States can continue to reduce the numbers of warheads carried on its Trident missiles under the New START Treaty. Unlike START, which attributed the same number of warheads to each missile of a given type, regardless of whether some of the missiles carried fewer warheads, the new treaty will count the precise number of warheads deployed on each missile. The parties will have opportunities to confirm that number with random, short-notice inspections. Moreover, the United States will not have to alter the platforms in the missiles, so it could restore warheads to its Trident missiles if circumstances changed.
Modernization Plans and Programs
The Navy initially planned to keep Trident submarines in service for 30 years, but has now extended that time period to 42 years. This extension reflects the judgment that ballistic missiles submarines would have operated with less demanding missions than attack submarines, and could, therefore, be expected to have a much longer operating life than the expected 30 year life of attack submarines. Therefore, since 1998, the Navy has assumed that each Trident submarine would have an expected operating lifetime of at least 42 years, with two 20-year operating cycles separated by a two-year refueling overhaul. (55) The Navy has also pursued a number of programs to ensure that it has enough missiles to support this extended life for the submarines.
Trident Missile Production and Life Extension
The Navy purchased 461 Trident II (D-5) missiles through FY2009. After finalizing the plan to deploy all 14 Trident submarines with D-5 missiles, the Navy extended Trident production through 2013, and now expects to purchase 561 Trident missiles, at a rate of around 24 missiles per year. (56) The Navy expects to maintain a fleet of 12 operational Trident submarines. Although each submarine contains 24 launch tubes for ballistic missiles, DOD has indicated that, under the New START Treaty, each submarine will deploy with only 20 missiles. It will "eliminate" the other four launch tubes on each submarine by removing a critical component needed to launch missiles. It will not need to actually dismantle the launch tube or alter the submarine.
Although the Navy plans to deploy its submarines with only 240 ballistic missiles, it will need the a greater number to support the fleet throughout the life-cycle of the Trident missiles. Around 50 of the Trident missiles are available for use by Great Britain in its Trident submarines. The remainder would support the missile's test program throughout the life of the Trident system.
The Navy is also pursuing a life extension program for the Trident II missiles, so that they will remain capable and reliable throughout the 45-year life of the Trident submarines. As a result, the funding for the Trident II missile will support the purchase of additional solid rocket motors, beyond those needed to complete the buy of 561 missiles, and other critical components required to support the missile throughout its service life. The Navy expects the refurbished missiles to reach their IOC in 2013.
The Navy allocated $5.5 billion to the Trident II missile program in FY2008 and FY2009. This funding supported the purchase of an additional 36 Trident II missiles. The Navy spent $1.05 billion on Trident II modifications in FY2010 and requested $1.1 billion in FY2011. In FY2010, $294 million was allocated to the purchase of 24 new missiles, 154.4 million was allocated to missile support costs, and $597.7 million was allocated to the Trident II Life Extension program. In FY2011, the Navy requested $294.9 million for the purchase of 24 new missiles, $156.9 million to missile support costs, and $655.4 million to the Trident II Life Extension Program. The FY2012 budget requests $1.3 billion for Trident II missile program. Within this total, $191 million is allocated to the purchase of 24 additional new missiles, $137.8 million is allocated to missile support costs, and $980 million is allocated to the Trident II Life Extension Program.
W76 Warhead Life Extension
The overwhelming majority of Trident missiles are deployed with the MK4/W76 warhead, which, according to unclassified estimates, has a yield of 100 kilotons. (57) It is nearing the end of its service life and is currently undergoing a life extension program that is designed to enhance its capabilities. According to some reports, the Navy had initially planned to apply this program to around 25% of the W76 warheads, but has increased that plan to cover more than 60% of the stockpile. The life extension program is intended to add 30 years to the warhead life "by refurbishing the nuclear explosive package, the arming, firing, and fusing system, the gas transfer system, and associated cables, elastomers, valves, pads, cushions, foam supports, telemetries, and other miscellaneous parts." The FY2012 budget request for the Department of Energy includes $257 million for the W-76 LEP.
Several questions came up during the life extension program. For example, some weapons experts questioned whether the warhead's design is reliable enough to ensure that the warheads will explode at its intended yield. (58) In addition, in June 2006, an inspector general's report from the Department of Energy questioned the management practices at the National Nuclear Security Administration (NNSA), which is responsible for the life extension program, arguing that management problems had led to delays and created cost overruns in the program. This raised questions about whether NNSA would be able to meet the September 2007 delivery date for the warhead, (59) and, when combined with other technical issues delayed the delivery of the first W-76 warhead until August 2008. The Navy accepted the first refurbished warhead into the stockpile in August 2009. (60) This program is scheduled to continue through FY2017.
Conventional Trident Modification
In the report of the 2006 Quadrennial Defense Review, the Pentagon called for the deployment of conventional warheads on a portion of its Trident SLBMs. (61) According to DOD's plan, the Navy could have deployed two Trident missiles on each submarine with conventional warheads and deployed 4 warheads deployed on each of these missiles, for a total force of 96 conventional warheads. This would have provided the United States with the capability to launch conventional warheads against targets around the world in less than an hour, a capability that does not now exist unless U.S. forces are forward-based in the region where the targets might be. The Navy requested $127 million for FY2007 to begin this program, but Congress did not authorize or appropriate the funding in the FY2007 Defense Authorization or Defense Appropriations bills, instead questioning the need for and intentions of the program, while raising concerns about the possibility that other nations might misinterpret the launch of a conventional Trident missile.
The Navy requested $175 million for this program in FY2008. The Senate Armed Services Committee, in its version of the FY2008 Defense Authorization Bill (S. 1547, S.Rept. 110-77), recommended that no funding be provided specifically for the CTM program, and that all the funding for the CTM and other "prompt global strike" programs be pooled to support a "coordinated look at a variety of kinetic non-nuclear concepts is necessary to address the feasibility of a prompt global strike." In the final version of the Defense Authorization Bill for FY2008 (H.Rept. 110-477), the conference committee adopted that Senate's approach, combining the funding in a single account. In subsequent years, the funding for conventional prompt global strike programs has remained in a single account, and Congress continued to reject separate funding for the CTM program.
The Navy is currently conducting development and design work on a new class of ballistic missile submarines, known as the SSBN(X) program, that will replace the Trident submarines as they reach the end of their service lives. (62) The Trident submarines will begin to retire in 2027, and the Navy has indicated that it would need the new submarines to begin to enter the fleet by 2029, before the number of Trident submarines falls below 12. (63) According to Admiral Stephen Johnson, the Navy would have to begin construction of its new submarine by 2019 so that it could begin to enter the fleet in 2029. (64) In April 2009, Secretary of Defense Robert Gates announced that the Navy would formally begin the replacement program for the Trident submarines in FY2010. (65) The SSBN(X) program received $497.4 million in research and development funding in the Navy's FY2010 budget. The Navy requested an additional $672.3 million in research and development funding for the program in its FY2011 budget proposal. The FY2012 budget includes $1.07 billion to develop the SSBN(X), with an expected funding level of $29.4 billion between 2011 and 2020.
The Navy plans to begin the detailed design for the submarine and to begin advanced procurement of critical components in FY2015. The seven-year construction period for the first submarine will begin in FY2019. The Navy initially estimated that each submarine in this program could cost $6 billion to $7 billion in FY2010 dollars. It has worked to redesign the submarine and reduce the costs, with the plan to hold each submarine to around $4.9 billion. Officials in the Navy and analysts outside government have expressed concerns about the cost of this program, and about the effect that these costs may have on the rest of the Navy's shipbuilding plans.
As a part of its effort to reduce costs, the Navy is designing the new submarines with only 16 ballistic missile launch tubes. The existing Trident submarines have 24 launch tubes, and each currently carries 24 missiles, although the Navy plans to reduce this number to 20 missiles on each submarine as the United States reduces its forces to comply with the New START Treaty. Congress questioned the Navy on this plan during hearings in April 2011, with some Members questioning whether the United States would be able to deploy enough warheads if it reduced the numbers of missiles on each submarine. Admiral Terry Benedict, the Director of the Navy's Strategic Systems Program Office, testified that the current international security environment, along with the Navy's ability to "upload" warheads onto Trident missiles, convinced him, along with other Navy and STRATCOM officials, that they could be comfortable with this configuration. (66)
A recent report indicates, however, that the Office of Management and Budget (OMB) has suggested that the Navy reduce the number of SSBNs in the fleet to 10, but increase the number of launch tubes on each submarine to 20. (67) According to the OMB analysis, this could save the Navy $7 billion over the life of the fleet, by reducing acquisition costs and operating costs. It would not, however, undermine the submarines' mission because, with 20 missiles per submarine, the Navy would still be able to cover the full range of targets assigned to the Trident fleet. Analysts outside government have offered similar suggestions, noting that the Navy could save $27 billion over 10 years and $120 billion over the life of the fleet if the Navy built 8, rather than 12 submarines. (68) Moreover, according to this analysis, the Navy would be able to deploy the necessary number of warheads on these submarines, even if it did not increase the number of launch tubes, by deploying more warheads on each of the Trident missiles on the submarine.
Generally, the number of launch tubes on the submarines should not affect the number of warheads carried by each submarine or the ability of the fleet to hold a range of potential targets at risk. Trident missiles can be equipped with 8 warheads each, but, in their current configuration, with 24 missiles on each submarine, the missiles carry only 4 or 5 warheads each, on average. This number would drop to 3-4 warheads per missile, as the United States reduced to the levels in New START. If the new submarines carry only 16 missiles, rather than the 20 planned under New START, then they could deploy with 5-6 warheads per missile. In essence, the Navy would put the same number of warheads on each submarine, but would just spread them over a smaller number of missiles. Moreover, as the United States reduces its forces to New START levels, the lower number of missiles per submarine will allow the United States to retain a larger number of submarines, without exceeding the treaty's limit of 700 operational delivery vehicles. This will allow the Navy to maintain a fleet of 12 submarines, and to operate those submarines with continuous deployments from two bases.
The Air Force began to deploy the B-1 bomber in the mid-1980s and eventually deployed a fleet of 96 aircraft. After several crashes, the Air Force was left with 92 bombers in 2001. It has sought to retire 30 of the aircraft, leaving a force of 62 bombers, but has met resistance from Congress. The B-1 served exclusively as a nuclear delivery vehicle through 1991, carrying short-range attack missiles and gravity bombs. Because these bombers were not equipped to carry nuclear-armed air-launched cruise missiles, each counts as a single delivery vehicle and a single warhead under START. In 1993, the Air Force began to convert the B-1 bombers to carry conventional weapons. This process was completed in 1997 and the B-1 bomber is no longer equipped to carry nuclear weapons, although it still counts against the START limits. Neither the bomber nor its weapons count against the limits in the Moscow Treaty. The bomber has contributed to U.S. conventional operations in Afghanistan and Iraq.
The Air Force has 20 B-2 bombers, based at Whiteman AFB in Missouri. (69) The B-2 bomber can carry both B-61 and B-83 nuclear bombs, but is not equipped to carry cruise missiles. It can also carry conventional weapons, and has participated in U.S. military campaigns from Bosnia to Iraq. It is designed as a "low observable" aircraft, and was intended to improve the U.S. ability to penetrate Soviet air defenses. However, according to recent reports, the Air Force is contemplating modifying the bomber so that it can also serve as a standoff-capable platform. In October 2009, General Donald Alston, the Assistant Chief of the Air Force for Strategic Deterrence and Nuclear Integration, indicated that the B-2 would need significant upgrades to contribute to this mission. (70)
According to unclassified estimates, the United States has around 550 B-61 and B-83 bombs. (71) The B61-11, a modification developed in the 1990s, has a hardened, modified case so that it can penetrate some hardened targets, although probably not those encased in steel and concrete. The B-83 bomb is a high yield weapon, that is also designed to destroy hardened targets, such as ICBM silos. The National Nuclear Security Administration reported that it had completed its life extension program for two versions of the B-61 bomb in early 2009. The B-2 bomber can also carry the B-61-Mod 7, a version that has not yet been through a life-extension program. Reports indicate that this version would be included in the "Mod-12" life extension program for the B-61, along with two other tactical versions of the bomb. However, in the FY2010 Energy and Water Appropriations Bills, Congress reduced funding for this program and limited the available funding to modifications of the bombs' non-nuclear components. These restrictions were reportedly designed to slow the program until the Administration reported, through the Nuclear Posture review, on its future plans for U.S. nuclear weapons programs. (72)
The Obama Administration strongly supported the life extension program for the B-61 bomb in the Nuclear Posture Review. The report indicated that "the Administration will fully fund the full scope LEP study and follow-on activities for the B-61 bomb ... to ensure first production begins in FY2017." The NPR noted that life extension program for the B-61 bomb, which would include enhancing safety, security, and use control, would also support U.S. extended deterrence goals by allowing the United States to retain the capability to forward-deploy U.S. nuclear weapons on B-2 bombers and tactical fighter-bombers. (73) The Administration has requested $224 million for the B-61 LEP in FY2012.
The Air Force maintains around 85 B-52H aircraft at two bases, Barksdale, LA, and Minot, ND. (74) The Air Force began to retire the first of 18 B-52 bombers scheduled for retirement at the end of July 2008. (75) The B-52 bomber, which first entered service in 1961, is equipped to carry nuclear or conventional air-launched cruise missiles and nuclear-armed advanced cruise missiles. The B-52 bombers can also deliver a wide range of conventional arms.
The Air Force has proposed cutting the B-52 fleet on many occasions in the last 15 years. For example, when the United States identified the force structure that it would deploy under the START Treaty, it indicated that it would only seek to retain 76 B-52 bombers. Congress, however, rejected the Clinton Administration's proposal, and the United States retained the full fleet of 94 aircraft.
The 2006 Quadrennial Defense Review called for a significant change to the B-52 fleet, reducing it from 94 to 56 aircraft. The budget request for FY2007 indicated that the Air Force planned to retire 18 bombers in FY2007 and 20 in FY2008. At the same time, the QDR called for continuing improvements to the B-1, B-2, and B-52 bombers' conventional capabilities using the funds that were saved by the retirement of the 38 aircraft. The Air Force has argued that it can reduce the number of deployed bombers, without reducing the overall capabilities of the bomber fleet, because these new weapons have "raised the efficiency" of the bomber platform. At hearings before the Senate Armed Services Committee, General James E. Cartwright, the Commander of STRATCOM, noted that "the next generation weapons that we're fielding, these air-launched cruise missiles, the joint direct attack munitions, et cetera, are much more efficient than they were in the past." (76) General Cartwright also indicated that, in spite of the reduced size of the fleet, the Air Force would continue to deploy B-52 bombers at two bases.
During the FY2007 budget cycle, Congress rejected the Pentagon's proposals for at least part of the B-52 fleet. The House, in its version of the FY2007 Defense Authorization Bill, prohibited the Air Force from retiring any of the B-52 aircraft, and mandated that it maintain at least 44 "combat coded" aircraft until the Air Force began to replace the B-52 with a new bomber of equal or greater capability. It stated, as a part of its rationale for this rejection, that it appeared the reduction was based on the reduced need for nuclear-capable bombers and did not take into consideration a growing need for long-range conventional strike capabilities. (77) The Senate agreed to permit the Air Force to retire 18 B-52 aircraft, but stated that it expected no further reduction in the size of the force, noting that a further reductions might "prevent our ability to strike the required conventional target set during times of war." (78) The conference committee (H.R. 5122, [section]131) combined these two provisions, allowing the retirement of no more than 18 aircraft after the submission of a report, and mandating that the Air Force retain at least 44 "combat coded" aircraft. These restrictions are to remain in place until 2018, or until a new long-range strike aircraft "with equal or greater capability than the B-52H model aircraft" attained initial operational capability, if that occurred first. Congress also stated that no funds could be spent to retire any B-52 aircraft until the Secretary of the Air Force submitted a report to Congress that described the Air Force plan for the modernization of the B-52, B-1, and B-2 bomber fleets; how many bombers would be assigned two nuclear and conventional missions if the United States had to execute "two overlapping 'swift defeat' campaigns;" a justification of the cost and projected savings of any reductions to the B-52H bomber aircraft fleet; and the life expectancy of each bomber aircraft to remain in the bomber force structure and the capabilities of the bomber force structure that would be replaced by a new bomber aircraft.
The Air Force indicated that the report on the bomber fleet would be ready in the fall of 2007. Further, in testimony before the Armed Services Committee, the Air Force indicated that it still planned to reduce the B-52 fleet to 56 aircraft, with 32 combat coded aircraft included in the fleet. But, in recognition of the congressional mandate, it was seeking a way to maintain 44 combat coded aircraft, the minimum set by Congress, within the smaller fleet of 56 aircraft. It also stated that it planned to store the 20 aircraft it wanted to retire in FY2008 on ramps at Barksdale Air Force Base; the aircraft would be kept in serviceable condition, but would not receive any capabilities upgrades. (79) Congress once again rejected this proposal. In the FY2008 Defense Authorization Bill (H.R. 1585, [section]137), Congress mandated that the Air Force maintain a fleet of 74 B-52 bombers, with no less than 63 in the Primary Aircraft inventory and 11 backup aircraft. Two additional aircraft would be designated as "attrition reserve." The conference committee indicated that the members agreed that a fleet of fewer than 76 aircraft would be insufficient to meet long-range strike requirements.
The growing interest in long-range strike capabilities, and the continuing addition of precision conventional weapons to these aircraft, demonstrates that the Pentagon and STRATCOM view the U.S. bomber fleet as essential to U.S. conventional weapons capabilities. Further, the need for long-range strike capabilities, rather than an interest in maintaining the nuclear role for bombers, (80) appeared to be driving decisions about the size and structure of the bomber fleet. There are some indications that, during the discussions on the 2006 QDR, some in the Pentagon argued that the all the B-52 bombers should be removed from the nuclear mission. Moreover, in November 2008, Secretary of the Air Force Michael Donley noted that the role that the bombers play in nuclear deterrence could be reduced in the future, if the United States and Russia negotiate further reductions in their nuclear arsenals.
This focus began to shift, however, in 2008. Several recent studies have noted that a lack of attention paid in the Air Force and, more broadly, in DOD, to the bombers' nuclear mission seems to be one of the factors that led to the episode in August 2007, when a B-52 bombers flew from Minot to Barksdale with six cruise missiles that carried live nuclear warheads. (81) The Air Force is pursuing a number of organizational and procedural changes to increase its focus on the nuclear mission and "reinvigorate" its nuclear enterprise. For example, it plans to "stand-up" a B-52 bomber squadron that will focus specifically on the nuclear mission. (82) This new unit would add 10 bombers to the 12 already deployed at Minot. While all the B-52 bomber crews and aircraft will retain their nuclear roles, this added squadron will participate in a greater number of nuclear exercises and training missions. The aircraft in the squadron will rotate from other missions, but will remain designated as the nuclear squadron for full year. The Air Force hopes this construct will improve not only the operational proficiency of the crews, but also their morale and their confidence in the value of the nuclear mission. The new squadron to began its operations in early 2010.
With this change, Secretary of Defense Gates stated, in April 2009, that the Air Force planned to retain 76 B-52 bombers. The 2010 Nuclear Posture Review also indicated that the United States currently has 76 B-52 bombers equipped to carry nuclear weapons. It determined that the Air Force would retain nuclear-capable bombers, but it would also convert some B-52s to a conventional-only role. The 1251 report also indicates that the Air Force plans to retain the B-52 bombers in the fleet through at least 2035, to meet both nuclear and conventional mission requirements.
The B-52 bomber was equipped to carry both the Air-Launched cruise missile (ALCM) and Advanced Cruise Missile (ACM). The ACM reportedly had a modified design with a lower radar cross-section, making it more "stealthy" than the ALCM. According to Air Force figures, in 2006, the United States had 1,142 ALCMs and 394 ACMs. (83) Although these weapons represented a majority of the weapons that U.S. bombers could carry on nuclear missions, the Department of Defense decided to retire many of these missiles. In his statement to the Senate Armed Services Committee's Subcommittee on Strategic Forces, Major General Roger Burg indicated that this study had concluded, and the Secretary of Defense had directed, that the Air Force retire all the Advanced Cruise Missiles, although some could be converted to carry conventional warheads, and reduce the ALCM fleet to 528 cruise missiles. The excess ALCMs will also be eliminated, and the remaining missiles would be consolidated at Minot Air Force Base. With all the ALCMs consolidated at Minot Air Force Base, the bombers at Barksdale may no longer be included in the nuclear mission.
Both the ALCM and ACM were set to undergo life-extension programs so that they could remain in service through 2030. (84) Both cruise missiles also carry the W-80 warhead, which was scheduled to for a life-extension program. However, the Department of Defense no longer plans to support the W-80 refurbishment program. (85) Nevertheless, the Air Force plans to sustain the ALCM in the fleet through 2030.
According to the 1251 Report, the Air Force is planning to replace the ALCM with a new advanced long range standoff (LRSO) cruise missile. It has already begun a capabilities-based assessment for this missile, and will conduct an analysis of alternatives (AOA) from early 2011 through mid-2013. According to DOD, the AOA will "define the platform requirements, provide cost-sensitive comparisons, validate threats, and establish measures of effectiveness, and assess candidate systems for eventual procurement and production" of the new missile. (86) In addition, the FY2011 DOD budget contains $3.63 million for the Air Force "to complete ongoing technical studies on a new cruise missile." The budget also indicates that research and development funding could increase sharply in the 2013-2015 time frame, after the completion of the AOA. Air Force officials estimate that a new ALCM could eventually cost $1.3 billion. (87) The Air Force plans to begin initial production of the new cruise missile around 2025, so that it can replace the ALCM as it is retired from the force.
Future Bomber Plans
The Air Force has also begun to plan for the development of a new strategic bomber. It initially planned to introduce the new bomber into the fleet around 2018. According to former Air Force Secretary Michael Wynne, the service was seeking a bomber with not only stealth capabilities and long range, but also one with "persistence," one that could "stay airborne and on call for very long periods." (88) The start of the study on a new bomber, known as an Analysis of Alternatives (AOA), had been delayed by a dispute over whether the study should stand alone or be merged with another AOA on prompt global strike (PGS). While a future bomber could be a part of the PGS mission, other systems, such as hypersonic technologies and missiles, would also be a part of the effort to strike anywhere around the world at long range. General Cartwright, the former head of STRATCOM, reportedly supported a plan to merge the two efforts, so that the considerations of capabilities for a new bomber would be measured along side other systems, both to balance the force and avoid redundancy across the force. (89) On the other hand, the former Air Force Chief of Staff, General T. Michael Moseley, reportedly preferred to keep the two studies separate. He argued that a bomber with long-range strike capabilities must have "persistent, survivable, and penetrating capabilities" while a platform with PGS capabilities could be "standoff weapon that is very, very fast." (90) This position reportedly prevailed, with the Air Force deciding, in May 2006, to keep the two studies separate. (91)
This dispute revealed wide-ranging differences, within the Air Force and Pentagon, about the goals for and capabilities that should be sought in a new bomber program. (92) The dispute focused, however, on conventional capabilities; it seems to be almost a foregone conclusion that nuclear capabilities, or the need for a bomber leg of the nuclear triad, will not drive the discussion or analysis.
In early May 2007, the Air Force indicated that it had decided that the next generation bomber would be manned and subsonic, although it would incorporate some stealth characteristics. (93) It decided that it would not pursue supersonic capabilities, or an unmanned option, to contain costs and maintain the capabilities of the future aircraft. In October 2008, Air Force Secretary Michael Donley indicated that the new bomber would also be capable of carrying nuclear weapons. (94)
However, on April 6, 2009, in a briefing describing the FY2010 defense budget, Secretary of Defense Robert Gates stated that the Air Force would not "pursue a development program for a follow-on Air Force bomber until we have a better understanding of the need, the requirement and the technology." (95) Specifically, he suspended the program until DOD completed the QDR and Nuclear Posture Review. In September 2009, General Norton Schwartz, the Chief of Staff of the Air Force, acknowledged that the Air Force is still seeking to develop a new "long-range strike" aircraft. (96) Moreover, Secretary of Defense Gates has reportedly supported efforts to develop a new platform for this mission. Its possible that this new airplane would serve as both a bomber and a reconnaissance aircraft. (97)
The 2010 Quadrennial Defense Review, published in February 2010, indicated that the Air Force was reviewing options for fielding survivable, long-range surveillance and strike aircraft as part of a comprehensive, phased plan to modernize the bomber force." (98) The report also noted that Secretary of Defense Gates ordered a follow-on study to the QDR to determine "what combination of joint persistent surveillance, electronic warfare, and precision-attack capabilities, including both penetrating platforms and stand-off weapons, will best support U.S. power projection operations over the next two to three decades." Although the study was just beginning, the DOD budget request for 2011 includes $200 million for the new bomber, and DOD documents indicated that expenditures on the bomber could total $1.74 billion through 2015. (99) Secretary Gates has indicated that he expects the Air Force to field the next generation bomber in the late 2020s. (100)
The update to the 1251 Report, submitted to the Senate before its vote on the New START Treaty, emphasized that the United States will maintain the bomber leg of the strategic triad and that DOD is committed to modernizing the bomber force. The report noted that long-range strike study was not questioning whether the United States would pursue a new heavy bomber, but on "the appropriate type of bomber and the timelines for development, production, and deployment." (101) The report indicated that this study would advise the President's budget submission for FY2012. Air Force officials have echoed this prediction, noting that Secretary Gates seemed inclined to accept the Air Force's recommendations on the building of a new long-range bomber. (102) Secretary Gates confirmed this approach in January 2011, when he announced the Air Force would develop a new bomber "using proven technologies," and that this bomber would be nuclear-capable. (103) The Pentagon has requested $197 million in the FY2012 budget on a new bomber. The budget documents indicate that the bomber will be nuclear-capable, and that the Air Force is planning to spend $3.7 billion on its development over the next five years. Air Force officials indicate that they hope to field between 80 and 100 of the new bombers in the future.
Issues for Congress
This report focuses on the numbers and types of weapons in the U.S. strategic nuclear force structure. It does not address the broader question of why the United States chooses to deploy these numbers and types of weapons, or more generally, the role that U.S. nuclear weapons play in U.S. national security strategy. This question is addressed in other CRS reports. (104) However, as the Obama Administration reviews and possibly revises the plans for U.S. nuclear force structure, Congress could address broader questions about the relationship between these forces and the role of nuclear weapons.
The Bush Administration argued that, because the United States and Russia are no longer enemies, the United States would not size or structure its nuclear forces simply to deter the "Russian threat." Instead, nuclear weapons would play a broader role in U.S. national security strategy. The Obama Administration, in contrast, noted that there is a relationship between the size of the U.S. arsenal and the size of the Russian arsenal. The 2010 NPR states that
Russia's nuclear force will remain a significant factor in determining how much and how fast we are prepared to reduce U.S. forces. Because of our improved relations, the need for strict numerical parity between the two countries is no longer as compelling as it was during the Cold War. But large disparities in nuclear capabilities could raise concerns on both sides and among U.S. allies and partners, and may not be conducive to maintaining a stable, long-term strategic relationship, especially as nuclear forces are significantly reduced. (105)
The Bush Administration's 2001 Nuclear Posture Review determined that the United States would need to maintain between 1,700 and 2,200 operationally deployed nuclear warheads. The Bush Administration also indicated that the United States would maintain in storage many of the warheads removed from deployed forces, and would maintain the capability to restore some of these warheads to the deployed forces to meet unexpected contingencies. The Obama Administration concluded that the United States could reduce its forces to 1,550 deployed warheads, and agreed to do so under the New START Treaty, but it also plans to retain the capability to restore warheads to its deployed forces. It also plans to retain many warheads in storage, although it has indicated that the size of the total stockpile could decline as the United States reduces its deployed forces to the New START limits. (106)
Some analysts have questioned why the United States must maintain such a large force of nuclear weapons. They have questioned whether the United States would attack with such a large number of weapons if its own national survival were not at risk, and they note that only Russia currently has the capability to threaten U.S. national survival. They assert that the United States could likely meet any other potential contingency with a far smaller force of nuclear weapons. Some have concluded, instead, that the United States could maintain its security with a force of between 500 and 1,000 warheads. (107)
The Bush Administration disputed this view, noting that the United States has other potential adversaries, and, even if these nations do not possess thousands of nuclear warheads, some may expand their nuclear forces or chemical and biological capabilities in the future. And, it asserted that the need to assure allies and dissuade potential adversaries could require a force of significant size, regardless of the number of potential targets a nation might possess.
The Obama Administration has indicated that the United States may be able to reduce its numbers of deployed and nondeployed warheads further, but that it should do so in parallel with Russia. It indicated, in the 2010 NPR, that "large disparities in nuclear capabilities could raise concerns on both sides and among U.S. allies and partners, and may not be conducive to maintaining a stable, long-term strategic relationship." (108) The Department of Defense is currently conducting a new study, as a follow-up to the NPR, to determine how deeply the United States might reduce its forces, and how it should deploy the remaining forces.
When the Bush Administration announced the results of the 2001 Nuclear Posture Review, it indicated that the United States would retain a triad of ICBMs, SLBMs, and heavy bombers for the foreseeable future. The Obama Administration also offered continuing support for the retention of the strategic triad. Nevertheless, as the Obama Administration has outlined plans to modernize and replace the delivery vehicles in all three legs of the strategic triad, many analysts have begun to question whether the United States can afford to retain the triad and whether it can retain a robust deterrent without one of the current types of strategic delivery vehicles. (109)
The Obama Administration indicated, in the 2010 NPR, that the United States would convert some of its bombers to conventional-only missions. This is consistent with the view, among some analysts, that, in the future, the bombers may be more important in the conventional mission. As was noted above, most discussions about the bomber force focus on how many bombers, and what types of bomber weapons, the United States needs to bolster its conventional long-range strike capability. There is little, if any, discussion about the role that bombers may play in either nuclear deterrence, or, if deterrence fails, in the launch of U.S. nuclear weapons. It is not surprising that some in the Air Force and Pentagon, and some outside government have questioned the continuing need for nuclear-capable bombers. (110)
The Obama Administration has indicated that the United States will retain up to 420 ICBMs under the New START Treaty. Each will be equipped with a single warhead. Analysts have often argued, and the 2010 NPR affirmed, that single-warhead ICBMs bolster crisis stability, and discourage efforts by an adversary to launch a disarming first strike, because the cost of the strike, as measured by the number of attacking warheads, would exceed the benefits, as measured by the number of warheads destroyed. But this calculus is not dependent on the number of ICBMs in the fleet. (111) Moreover, these missiles will remain deployed at three ICBM bases.
The Obama Administration has indicated that it plans to retain 14 Trident submarines, at least through 2015, and then may reduce to 12 submarines. Moreover, the New START Treaty allows the United States to continue to reduce the warheads on each missile. It also allows the United States to eliminate some of the launch tubes by simply removing the gas generators that assist in the launch of the missiles. As a result, the United States will have a significant amount of flexibility in apportioning warheads among its SSBNs, and will almost certainly not have to eliminate any submarines to meet the new START limits. As a result, with its ability to remain invulnerable to detection and attack, and with the increasing accuracy and reliability of its missiles and warheads, the Trident fleet will continue to represent the "backbone" of the U.S. nuclear force.
The United States does not plan to alter the basic structure of its Trident fleet; it will continue to deploy its submarines at two bases, with a portion of the fleet deployed in the Atlantic Ocean and a portion deployed in the Pacific Ocean. However, if the United States reduces the size of its nuclear arsenal significantly below the limits in the New START Treaty, the United States may find it difficult to retain its "triad" of nuclear delivery vehicles. Presidents Obama and Medvedev have pledged to reduce nuclear weapons in a "step-by-step" process, with additional reductions coming in a future treaty. Most analysts who propose deep reductions, to perhaps 1,000 nuclear warheads, readily acknowledge that these reductions could affect the U.S. triad, and support changes in the U.S. force structure.
Some argue that the United States should retain only the warheads on its Trident submarines. It could convert its bombers to conventional missions and perhaps eliminate its land-based ICBMs. However, the United States might also have to reduce the size of its Trident fleet, from the current 14 submarines to perhaps 8 or 10 submarines, if it reduced to 1,000 warheads. And, with so few submarines, the United States might have to eliminate one of its submarine bases, leaving it with submarines based only in the Atlantic or only in the Pacific Ocean. This change may not be consistent with current submarine operations and employment plans. President Obama and the U.S. military may want to consider the implications of these basing, operational, and policy changes, before deciding whether or not to reduce to 1,000 warheads, as opposed to choosing the warhead number first then deciding later how to base and operate the remaining nuclear forces.
Safety, Security, and Management Issues
In late August 2007, a B-52 bomber based in Minot, ND, took off on flight to Barksdale Air Force Base in Louisiana. The bomber carried 12 air-launched cruise missiles that were slated for retirement at Barksdale. As a result of a series of errors and missteps in the process of removing the missiles from storage and loading them on the bombers, six of the missiles carried live nuclear warheads, instead of the dummy warheads that were installed on missiles heading for retirement. This episode led to a series of studies and reviews by the Air Force that identified the source of the episode and identified a number of steps the Air Force should take to improve its handling of nuclear weapons. (112)
In early June 2008, Secretary of Defense Robert Gates requested the resignations of the Secretary of the Air Force, Michael Wynne, and the Chief of Staff of the Air Force, General Michael Mosely, from their positions, at least in part, due to concerns about that shortcomings in the Air Force's handling of nuclear weapons "resulted from an erosion of performance standards within the involved commands and a lack of effective Air Force leadership oversight." (113) Secretary Gates appointed a task force, lead by former Secretary of Defense and Energy James Schlesinger, to provide "independent advice on the organizational, procedural and policy improvements necessary to ensure that the highest levels of accountability and control are maintained in the department's stewardship of nuclear weapons, delivery vehicles, sensitive components and basing procedures." (114)
Several of the studies that reviewed this event concluded that the Air Force leadership had lost its focus on the nuclear mission as it diverted resources to more pressing missions related to the ongoing conflicts in Iraq and Afghanistan. As a result the "nuclear enterprise" had been allowed to atrophy, with evident declines in morale, cohesion, and capability. (115) These reports suggested that the United States restore its focus on the nuclear mission and repair long-standing and often-identified deficiencies in manpower and training programs for crews that maintain and service nuclear weapons and operate nuclear-capable bombers. The studies identified a number of organizational changes to achieve these goals. For example, the Air Force has created a new Global Strike Command, based at Barksdale Air Force Base, that is responsible for both the ICBM force and the nuclear-capable bombers. This organization began its operations in early 2009. The Air Force has also established a new headquarters office in the Pentagon that will monitor and manage the resources and policies dedicated to the nuclear mission. The Air Force also altered its inspection program and its expectations for achievement during these inspections.
In a study published in April 2011, the Defense Science Board reviewed and evaluated the changes Air Force has made in its nuclear weapons enterprise. (116) The report noted that Air Force leadership "has taken decisive action to correct deficiencies, reinvigorate, and further strengthen the Air Force Nuclear Enterprise." (117) At the same time, though, the study noted that some of the "extraordinary measures" taken in response to the earlier lapses could have negative impacts if they are extended beyond the "period of urgent need." This problem was particularly evident in the areas of oversight and inspection. The study reported that there has been "intense attention to the issue of accountability and control of nuclear weapons-related materials." But the numerous and overlapping inspections have become so frequent and invasive that the units may not have the time or resources to correct deficiencies found during the many inspections. As a result, the task force concluded that the intense level of inspections and exercises had become counterproductive by interfering with the normal rhythm of operations at the wings. (118)
While the Air Force worked to increase the level of attention and accountability for its nuclear weapons after these incidents, others analysts found different lesson in the lapses. Some saw the decline of the Air Force nuclear enterprise as an inevitable part of the declining role of nuclear weapons in U.S. national security strategy and argued that the United States should extend the process by further reducing its nuclear arsenal and removing greater numbers of weapons from the operational force. For example, some suggested that the evident weaknesses in the Air Force's procedures argued for removing nuclear weapons from the whole of the bomber fleet. (119) Congress may address concerns about these issues, and review possible changes in command structures and security procedures, as it reviews nuclear weapons policies and programs during its next session.
(1) For a detailed review of U.S. nonstrategic nuclear weapons see, CRS Report RL32572, Nonstrategic Nuclear Weapons, by Amy F. Woolf.
(2) Natural Resources Defense Council. Table of U.S. Strategic Offensive Force Loadings. Archive of Nuclear Data. http://www.nrdc.org/nuclear/nudb/datab1.asp The same source indicates that the Soviet Union, in 1990, had just over 11,000 warheads on 2,332 strategic nuclear delivery vehicles.
(3) Russia, by the same accounting, had 3,909 warheads on 814 delivery vehicles. See U.S. Department of State, Bureau of Verification, Compliance and Inspection. Fact Sheet. START Aggregate Numbers of Strategic Offensive Weapons. October 1, 2009. Washington, DC.
(4) U.S. State Department, Bureau of Public Affairs, The Nuclear Nonproliferation Treaty: Promoting Disarmament, Washington, DC, April 27, 2010, http://www.state.gov/documents/organization/141497.pdf.
(5) The parties are to meet this limit within seven years of entry-into-force, which could occur in early 2011. For more information on the New START Treaty, see CRS Report R41219, The New START Treaty: Central Limits and Key Provisions, by Amy F. Woolf.
(6) The White House, Office of the Press Secretary, Remarks by President Obama, Prague, Czech Republic, April 5, 2009, http://www.whitehouse.gov/the_press_office/ Remarks-By-President-Barack-Obama-In-Prague-As-Delivered/.
(7) U.S. Department of Defense, Nuclear Posture Review, Washington, DC, April 6, 2010, p. 15. http://www.defense.gov/npr/docs/ 2010%20Nuclear%20Posture%20Review%20Report.pdf.
(8) U.S. Department of Defense. Annual Report to Congress, Fiscal Year 1989, by Frank Carlucci, Secretary of Defense. February 18, 1988. Washington, 1988. p. 54.
(9) In the early 1990s, SLBMs also acquired the accuracy needed to attack many hardened sites in the former Soviet Union.
(10) Natural Resources Defense Council. Table of U.S. Strategic Offensive Force Loadings. Archive of Nuclear Data. http://www.nrdc.org/nuclear/nudb/datab1.asp.
(11) GlobalSecurity.org LGM Minuteman III History and Poseidon C-3 History. http://www.globalsecurity.org/wmd/systems/lgm-30_3-hist.htm and http://www.globalsecurity.org/wmd/systems/c-3.htm.
(12) The older Poseidon submarines were in the process of being retired, and the number of missiles and warheads in the submarine fleet dropped quickly in the early 1990s, to around 2,688 warheads on 336 missiles by 1993. See Natural Resources Defense Council. Table of U.S. Strategic Offensive Force Loadings. Archive of Nuclear Data. http://www.nrdc.org/nuclear/nudb/datab1.asp.
(13) U.S. Department of State, Bureau of Verification, Compliance, and Implementation, The Legacy of START and Related U.S. Policies, Fact Sheet, Washington, DC, July 16, 2009, http://www.state.gov/t/avc/rls/126119.htm.
(14) President Bush announced the U.S. intention to reduce its forces on November 13, 2001, during a summit with Russia's President Vladimir Putin. The United States and Russia codified these reductions in a Treaty signed in May 2002. See CRS Report RL31448, Nuclear Arms Control: The Strategic Offensive Reductions Treaty, by Amy F. Woolf.
(15) U.S. Senate. Committee on Armed Services. Statement of the Honorable Douglas J. Feith, Undersecretary of Defense For Policy. February 14, 2002.
(16) Hebert, Adam. The Future Missile Force. Air Force Magazine. October 2005.
(17) Beginning in FY1996, and continuing through the end of the Clinton Administration, Congress had prohibited the use of any DOD funds for the elimination of strategic nuclear delivery vehicles, below START I levels, until START II entered into force. See, for example, the FY1998 Defense Authorization Act (P.L. 105-85, [section]1302). Congress lifted this restriction in the FY2002 Defense Authorization Act (P.L. 107-107, [section]1031).
(18) "U.S. Meets Moscow Nuclear Reduction Commitment Three Years Early," Global Security Newswire, February 11, 2009.
(19) U.S. Department of Defense, Nuclear Posture Review, Washington, DC, April 6, 2010, p. 22. http:// www.defense.gov/npr/docs/2010%20Nuclear%20Posture%20Review%20Report.pdf.
(20) Ibid. p. 20.
(21) U.S. Department of Defense, November 2010 Update to the National Defense Authorization Act of FY2010, New START Treaty Framework and Nuclear Force Structure Plans, Washington, DC, November 17, 2010, http://www.lasg.org/CMRR/Sect1251_update_17Nov2010.pdf.
(22) U.S. Department of Defense. Report of the 2006 Quadrennial Defense Review. Washington, February 2006. p. 50.
(23) U.S. Senate, Committee on Armed Services, Hearing on Global Strike Plans and Programs. Testimony of James E. Cartwright, Commander U.S. Strategic Command. March 29, 2006.
(24) Johnson, Peter. Growth Worries Base Boosters. Great Falls Tribune. January 19, 2006.
(25) Global Security Newswire. U.S. Deactivates 50 Strategic Missiles. August 4, 2008.
(26) U.S. Senate, Committee on Armed Services, Hearing on Global Strike Plans and Programs. Testimony of James E. Cartwright, Commander U.S. Strategic Command. March 29, 2006.
(27) Private communication.
(28) See Robert S. Norris and Hans M. Kristensen. U.S. Nuclear Forces, 2006. Bulletin of the Atomic Scientists. January/February 2006.
(29) Hebert, Adam. The Future Missile Force. Air Force Magazine. October 2005.
(30) See, for example, Jeffrey Lewis. STRATCOM Hearts MIRV. ArmsControlWonk.com, January 30, 2006.
(31) See, U.S. Senate, Committee on Armed Services, Hearing on Global Strike Plans and Programs. Testimony of James E. Cartwright, Commander U.S. Strategic Command. March 29, 2006.
(32) Sirak, Michael. Air Force Prepared To Draaw Down Minuteman III Fleet by 50 Missiles. Defense Daily. April 17, 2007.
(33) Single-warhead ICBMs are considered to be stabilizing because it would take two attacking warheads to destroy the silo. If each side has approximately the same number of warheads, than an attack on a single warhead missile would cost more warheads than it would kill, and, therefore, would not be considered to be lucrative.
(34) Robert S. Norris and Hans M. Kristensen. U.S. Nuclear Forces, 2006. Bulletin of the Atomic Scientists. January/February 2006.
(35) Sirak, Michael. Minuteman Fleet has Life Beyond 2020, Says Senior Air Force Space Official. Defense Daily. June 14, 2006.
(36) LGM Minuteman III Modernization. Globalsecurity.org.
(37) Donnelly, John M. Air Force Defends Spending Half A Billion on Iffy ICBMs. Defense Week. September 10, 2001. p. 1.
(38) LGM Minuteman III Modernization. Globalsecurity.org.
(39) Lt. Gen. Frank G. Klotz, Vice Commander, Air Force Space Command. Transcript of Speech to the National Defense University Breakfast. June 13, 2006.
(40) Tom Collina, Fact Sheet: U.S. Nuclear Modernization, Arms Control Association, Washington, DC, January 5, 2009, http://www.armscontrol.org/USNuclearModernization.
(42) Selinger, Mark. Minuteman Replacement Study Expected to Begin Soon. Aerospace Daily and Defense Report. June 25, 2004.
(43) Lt. Gen. Frank G. Klotz, Vice Commander, Air Force Space Command. Transcript of Speech to the National Defense University Breakfast. June 13, 2006.
(44) Jason Simpson, "Kehler: Air Force Investigating Minuteman III Follow-On System," Inside the Air Force, October 8, 2009. See, also, Jason Simpson, "Testers See no Problems With Minuteman III Missiles Lasting to 2030," Inside the Air Force, September 4, 2009.
(45) U.S. Department of Defense, November 2010 Update to the National Defense Authorization Act of FY2010, New START Treaty Framework and Nuclear Force Structure Plans, Washington, DC, November 17, 2010, p. 11. http://www.lasg.org/CMRR/Sect1251_update_17Nov2010.pdf.
(46) Connolly, Allison. For Four Subs, Its Good-bye Ballistic Missiles, Hello SEALs. Norfolk Virginia Pilot. December 18, 2004.
(47) Ohio Class SSGN Tactical Trident. GlobalSecurity.org http://www.globalsecurity.org/military/systems/ship/ssgn-726.htm.
(48) First Trident Submarine Converted. Associated Press. January 10, 2006.
(49) U.S. Congress. Senate. Armed Services Committee, Subcommittee on Strategic Forces. Fiscal Year 2008 Strategic Forces Program Budget. Hearing. Prepared statement of Mr. Brian R. Green, Deputy Assistant Secretary of Defense, Strategic Capabilities, p. 6. March 28, 2007. See also, Guided Missile Submarine Ohio Ready for Deployment. Inside the Navy, November 5, 2007.
(50) SSBN-726 Ohio-Class FBM Submarines, GlobalSecurity.org, http://www.globalsecurity.org/wmd/systems/ssbn-726-recent.htm.
(51) Morris, Jefferson. Older Trident Missiles to be Phased out by Fall, Admiral Says. Aerospace Daily and Defense Report, June 17, 2005.
(52) Robert S. Norris and Hans M. Kristensen. U.S. Nuclear Forces, 2006. Bulletin of the Atomic Scientists. January/February 2006.
(54) Even though four of these submarines are being converted to SSGNs, they still count under the START Treaty because they still have SLBM launch tubes. Each of those tubes count as six warheads. See U.S. Department of State. Bureau of Verification, Compliance, and Implementation. START Aggregate Number of Strategic Offensive Arms. April 1, 2006.
(55) SSBN Ohio-Class FBM Submarines. GlobalSecurity.org.
(56) Robert S. Norris and Hans M. Kristensen. U.S. Nuclear Forces, 2006. Bulletin of the Atomic Scientists. January/February 2006.
(57) Robert S. Norris and Hans M. Kristensen. U.S. Nuclear Forces, 2006. Bulletin of the Atomic Scientists. January/February 2006.
(58) Fleck, John. Flaws Seen in Sub-Launched Nuclear Warhead. Albuquerque Journal. July 8, 2004.
(59) Costa, Keith J. IG: Project Weaknesses put W-76 Warhead Refurbishment Plan at Risk. InsideDefense.Com, June 8, 2006.
(60) "Navy Receives First Refurbished W-76 Warheads," Global Security Newswire, November 6, 2009.
(61) For details, see, CRS Report R41464, Conventional Prompt Global Strike and Long-Range Ballistic Missiles: Background and Issues, by Amy F. Woolf.
(62) For details on this program, see CRS Report R41129, Navy Ohio Replacement (SSBN[X]) Ballistic Missile Submarine Program: Background and Issues for Congress, by Ronald O'Rourke.
(63) Christopher J. Castelli, "Navy Confronts $80 Billion Cost of New Ballistic Missile Submarines," Inside Defense, November 3, 2009.
(64) RADM Stephen Johnson, Director, Navy Strategic Programs Office. Speech at the NDU/NDIA Seminar Series, June 23, 2009.
(65) U.S. Department of Defense, Briefing by Defense Secretary Robert Gates and Marine Corps Gen. James Cartwright, Vice Chairman of the Joint Chiefs of Staff, Washington, DC, April 6, 2009, http://insidedefense.com/secure/data_extra/html3/dplus2009_0893_3.htm.
(66) Emelie Rutherford, "Navy Defends Plan for Just 16 Missile Tubes on Next Boomer," Defense Daily, April 7, 2011.
(67) Colin Clark, "OMB Pushes More Tubes, Fewer Boats for Ohio Replacement Subs," AOL Defense, November 4, 2011, http://defense.aol.com/2011/11/04/ omb-pushes-more-tubes-fewer-boats-for-ohio-replacement-subs/.
(68) Tom Collina and Kelsey Davenport, "U.S. Must Rethink New Subs, Bombers," Defense News, October 24, 2011.
(69) A B-2 bomber crashed on take-off from Anderson Air Force Base on Guam in late February 2008, reducing the number of deployed bombers from 21 to 20.
(70) Marina Malenic, "With Nex-Gen Bomber IN HOlding Pattern, Air Force Wants Further B-2 Mods," Defense Daily, October 21, 2009.
(71) Robert S. Norris and Hans M. Kristensen. U.S. Nuclear Forces, 2006. Bulletin of the Atomic Scientists. January/February 2006.
(72) Elaine M. Grossman, "Nuclear Bomb Update Effort Slowed by Posture Review, Science Studies," Global Security Newswire, January 19, 2010.
(73) U.S. Department of Defense, Nuclear Posture Review, Washington , DC, April 6, 2010, p. 27, http://www.defense.gov/npr/ docs/2010%20Nuclear%20Posture%20Review%20Report.pdf.
(74) A B-52 bomber crashed off the coast of Guam in July 2008.
(75) U.S. Air Force, Minot Air Force Base, Office of Public Affairs. B-52H Reaches Retirement. July 30, 2008.
(76) U.S. Senate, Committee on Armed Services, Hearing on Global Strike Plans and Programs. Testimony of James E. Cartwright, Commander U.S. Strategic Command. March 29, 2006.
(77) U.S. Congress. House. Committee on Armed Services. National Defense Authorization Act for Fiscal Year 2007. H.Rept. 109-452. May 5, 2006. p. 103.
(78) U.S. Congress Senate. National Defense Authorization Act for Fiscal Year 2007. S.Rept. 109-254. May 9, 2006. p. 94.
(79) U.S. Congress. Senate. Armed Services Committee, Subcommittee on Strategic Forces. Hearing on the Fiscal Year 2008 Strategic Forces Program Budget. Statement of Major General Roger Burg. March 28, 2007. p. 8.
(80) Carlo Munoz, "Donley: Role of Nuclear Bomber Fleet Could Be Curtailed," Inside the Air Force, November 14, 2008.
(81) For a detailed review of this incident see, Warrick, Joby and Walter Pincus. The Saga of a Bent Spear. Washington Post. September 23, 2007.
(82) Marcus Weisgerber, "USAF To Activate Rotational Nuclear Bomber Squadron Next Month," Inside Defense, September 26, 2008.
(83) The Air Force also has 289 ALCMs that have been converted to carry conventional warheads (CALCMs). See Michael Sirak. DOD Studies Future Role of Nuclear-Armed Cruise Missiles. Defense Daily, March 30, 2006.
(84) Robert S. Norris and Hans M. Kristensen. U.S. Nuclear Forces, 2006. Bulletin of the Atomic Scientists. January/February 2006.
(85) According to S.Rept. 109-274, Energy and Water Appropriations Bill 2007, the Nuclear Weapons Council and Department of Defense no longer support the W80 Life Extension activities. As a result, both the House (H.R. 5427) and Senate Appropriations Bills eliminate funding for this effort.
(86) U.S. Department of Defense, November 2010 Update to the National Defense Authorization Act of FY2010, New START Treaty Framework and Nuclear Force Structure Plans, Washington, DC, November 17, 2010, p. 12. http://www.lasg.org/CMRR/Sect1251_update_17Nov2010.pdf.
(87) Elaine M. Grossman, "Pentagon Eyes More than $800 Million for New Nuclear Cruise Missile," Global Security Newswire, March 9, 2010.
(88) Christie, Rebecca. Air Force To Step Up New Bomber Search in Next Budget. Wall Street Journal. June 29, 2006.
(89) Grossman, Elaine M. Cartwright Wants to See Strike Studies Await "Discovery" Process. InsideDefense.Com. April 6, 2006.0
(90) Bennet, John T. Internal Squabbles Holding Up Bomber Study, USAF Official Says. InsideDefense.com. April 21, 2006.
(91) Matishak, Martin. Long-Range, Prompt Global Strike Studies Will Remain Separate. InsideDefense.com. June 16, 2006.
(92) For more details on the proposed bomber, see CRS Report RL34406, Air Force Next-Generation Bomber: Background and Issues for Congress, by Jeremiah Gertler.
(93) Sirak, Michael. Air Force Identifies Manned, Subsonic Bomber as Most Promising 2018 Option. Defense Today. May 2, 2007.
(94) Carlo Munoz, "Donley: Next Generation Bomber Will Be Nuclear Capable by 2018," Inside the Air Force, October 31, 2008.
(95) U.S. Department of Defense, Briefing by Defense Secretary Robert Gates and Marine Corps Gen. James Cartwright, Vice Chairman of the Joint Chiefs of Staff, Washington, DC, April 6, 2009, http://insidedefense.com/secure/data_extra/html3/dplus2009_0893_3.htm.
(96) Otto Kreisher, "New Long-Range Strike Aircraft Still on Air Force's Radar," National Journal's CongressDaily AM, September 15, 2009.
(97) Marina Malenic, "DOD Officials Examining "Full Menu" of Long-Range Strike Options in Bomber Review," Defense Daily, October 7, 2009.
(98) U.S. Department of Defense, Quadrennial Defense Review Report, Washington, DC, February 2010, p. 33, http://www.defense.gov/qdr/images/QDR_as_of_12Feb10_1000.pdf.
(99) Elaine M. Grossman, "Pentagon Eyes More than $800 Million for New Nuclear Cruise Missile," Global Security Newswire, March 9, 2010.
(100) Andrea Shalal-Esa, "Gates Sees New U.S. Bomber Fielded in 2020s," Reuters, February 2, 2010.
(101) U.S. Department of Defense, November 2010 Update to the National Defense Authorization Act of FY2010, New START Treaty Framework and Nuclear Force Structure Plans, Washington, DC, November 17, 2010, p. 11. http://www.lasg.org/CMRR/Sect1251_update_17Nov2010.pdf.
(102) Emelie Rutherford, "Schwartz Hopeful About Long-Range Strike Funding," Defense Daily, November 29, 2010.
(103) Marcus Weisgerber, "Air Force To Develop New Long-Range, Optionally Manned Bomber," Inside the Air Force, January 6, 2011.
(104) See, for example, CRS Report RL31623, U.S. Nuclear Weapons: Changes in Policy and Force Structure, by Amy F. Woolf.
(105) U.S. Department of Defense, Nuclear Posture Review, Washington, DC, April 6, 2010, p. 30, http:// www.defense.gov/npr/docs/2010%20Nuclear%20Posture%20Review%20Report.pdf.
(106) On May 3, 2010, the Obama Administration announced that the United States has 5,113 warheads in its stockpile of nuclear weapons. This number includes the deployed warheads, active nondeployed warheads and inactive nondeployed warheads. For more information, see http://www.defense.gov/npr/docs/ 10-05-03_Fact_Sheet_US_Nuclear_Transparency_FINAL_w_Date.pdf.
(107) See, for example, Sidney D. Drell and James E. Goodby. What Are Nuclear Weapons For? Recommendations for Restructuring U.S. Strategic Nuclear Forces. Arms Control Association, Updated October 2007.
(108) U.S. Department of Defense, Nuclear Posture Review, Washington, DC, April 6, 2010, p. 30, http:// www.defense.gov/npr/docs/2010%20Nuclear%20Posture%20Review%20Report.pdf.
(109) Mark Thompson, "Nuclear Triad Warfare," Time Magazine, October 18, 2011.
(110) For a recent analysis of the possible future of the U.S. triad, see, Dr. Dana J. Johnson, Dr. Christopher J. Bowie, and Dr. Robert P. Haffa, Triad, Dyad, Monad? Shaping the U.S. Nuclear Force for the Future, Mitchell Institute for Airpower Studies, Washington, DC, November 2009.
(111) For recent arguments in favor of a larger ICBM force see, Senate ICBM Coalition, The Long Pole of the Nuclear Umbrella, A White Paper on the Criticality of the Intercontinental Balllistic Missile to the United States Security, Washington, DC, November 2009.
(112) See, for example, The Defense Science Board Permanent Task Force on Nuclear Weapons Surety. Report on the Unauthorized Movement of Nuclear Weapons. February 2008.
(113) Nuclear Lapses Trigger Ouster of Top U.S. Air ForceOfficials. Global Security Newswire. June 6, 2008.
(114) U.S. Department of Defense. Office of the Assistant Secretary of Defense (Public Affairs). Department of Defense Announces Task Force on Nuclear Weapons Management. June 12, 2008.
(115) See, for example, United States Air Force, Reinvigorating the Air Force Nuclear Enterprise, Prepared by the Air Force Nuclear Task Force, Washington, DC, October 24, 2008, http://www.af.mil/shared/media/document/AFD- 081024-073.pdf. See also, Report of the Secretary of Defense Task Force on DOD Nuclear Weapons Management (the Schlesinger Commission), Phase I: The Air Force's Nuclear Mission, Washington, DC September 2008. http://www.defenselink.mil/pubs/Phase_I_Report_Sept_10.pdf.
(116) Defense Science Board Permanent Task Force on Nuclear Weapons Surety, Independent Assessment of The Air force Nuclear Enterprise, Washington, D.C., April 2011. http://www.acq.osd.mil/dsb/reports/NWS_2010.pdf.
(117) Ibid., p. 16.
(118) Ibid., pp. 22-23.
(119) Kristensen, Hans. Nuclear Safety and the Saga of the Missing Bent Spear. Federation of the American Scientists. February 22, 2008. http://www.fas.org/blog/ssp/2008/02/nuclear_safety_and_the_saga_ab.php.
Author Contact Information
Amy F. Woolf
Specialist in Nuclear Weapons Policy
Table 1. U.S. Strategic Nuclear Forces Under START I and START II Deployed under START I (2001) Accountable System Launchers Warheads (a) Minuteman III ICBMs 500 1,200 Peacekeeper ICBMs 50 500 Trident I Missiles 168 1,008 Trident II Missiles 264 2,112 B-52 H Bombers (ALCM) 97 970 B-52 H Bombers (non- ALCM) 47 47 B-1 Bombers (b) 90 90 B-2 Bombers 20 20 Total 1,237 5,948 Planned for START II Accountable System Launchers Warheads Minuteman III ICBMs 500 500 Peacekeeper ICBMs 0 0 Trident I Missiles 0 0 Trident II Missiles 336 1,680 B-52 H Bombers (ALCM) 76 940 B-52 H Bombers (non- ALCM) 0 0 B-1 Bombers (b) 0 0 B-2 Bombers 21 336 Total 933 3,456 (a.) Under START I, bombers that are not equipped to carry ALCMs count as one warhead, even if they can carry up 16 nuclear bombs; bombers that are equipped to carry ALCMs count as 10 warheads, even if they can carry up to 20 ALCMs. (b.) Although they still count under START I, B-1 bombers are no longer equipped for nuclear missions. Table 2. U.S. Strategic Nuclear Forces under New START Estimated Current Forces and Potential New START Forces Estimated Forces, 2010 Possible Forces Under New START, 2017 (a) Launchers Warheads Total Deployed Warheads Launchers Launchers Minuteman 450 500 420 400 400 III Trident 336 1152 280 240 1090 B-52 76 300 74 42 42 B-2 18 200 18 18 18 Total 880 2152 792 700 1550 Source: CRS estimates. (a.) This force assumes that the United States retains 14 Trident submarines with 2 in overhaul,, In accordance with the terms of New START, the United States will eliminate 4 launchers on each submarine, so that each counts as only 20 launchers. In this case, the United States could retain 420 total and 400 deployed Minuteman III ICBMs.
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|Author:||Woolf, Amy F.|
|Publication:||Congressional Research Service (CRS) Reports and Issue Briefs|
|Date:||Nov 1, 2011|
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