ManTech Awarded $34.9 Million Contract from the Navy for the Design and Development of Militarized Products and Systems.

FAIRFAX, Va. -- ManTech International Corporation (Nasdaq:MANT), a leading provider of innovative technologies and solutions focused on mission-critical national security programs for the Intelligence Community and the Departments of Defense, State, Homeland Security, Justice and other U.S. federal government customers, announced today that it has been awarded a contract in the third quarter from the Naval Sea Systems Command (NAVSEA) to provide services for the design and development of militarized products for the Naval Surface Warfare Center (NSWC), Indian Head Division.

The multi-year effort, awarded under the NAVSEA SeaPort Enhanced contract, has a 12-month base-period, and four one-year option periods, for an estimated total value of $34.9 million. Under the contract, ManTech will provide Human System Integration (HSI) engineering, technical, and management services to products and systems such as unmanned vehicles, training ranges, air-to-air/air-to-ground weapons, and aerial target shipboard combat systems. Other support involves the design and development of performance tools; technical data support; product/systems deployment planning and support; testing; training; and program management support.

"Human System Integration engineering helps ensure that the needs of the sailor or warfighter are considered during the full cycle of system development - from design, to operation," said Jim Kelly, Chief Operating Officer, ManTech Gray Hawk. "We will apply our extensive experience working with the NSWC, and in Human System Integration, to help ensure that these systems maximize performance and reduce lifetime cost."

"This award further demonstrates the effectiveness of our integration process between ManTech and Gray Hawk and the additional strength of our combined capabilities," said Robert A. Coleman, President and Chief Operating Officer, ManTech International Corporation. "Providing HSI engineering support adds another dimension to the services that we can offer the Navy."

Subcontractors working with ManTech on the program are Applied Techniques Corporation, a woman-owned small business based in Maryland that provides HSI analysis; and HiPK, a Virginia-based, veteran-owned and operated small business that provides extensive consulting services for the Navy.

The Naval Surface Center at Indian Head, MD, provides special weapons support, explosives safety support, and ordnance environmental support to the U.S., foreign military, and ordnance industry. They design, scale up, and produce explosives, ordnance, and propellants used in all major DOD weapons systems.

About ManTech International Corporation:

Headquartered in Fairfax, Virginia, ManTech International Corporation is a leading provider of innovative technologies and solutions for mission-critical national security programs for the Intelligence Community and the Departments of Defense, State, Homeland Security, Justice and other U.S. federal government customers. ManTech's expertise includes systems engineering, systems integration, technology and software development, enterprise security architecture, information assurance, intelligence operations support, network and critical infrastructure protection, information technology, communications integration and engineering support. The company supports the advanced telecommunications systems that are used in Operation Iraqi Freedom and in other parts of the world; provides the physical and cyber security to protect U.S. embassies all over the world; has developed a secure, collaborative communications system for the U.S. Department of Homeland Security; and is helping the Department of Justice's U.S. Marshals Service deploy a common, office automation system. With projected 2005 revenues of approximately $1 billion and 6,000 highly qualified employees, the company operates in the United States and 40 countries worldwide. In 2004, ManTech was selected by Business Week magazine as one of the Top 100 Hot Growth Companies and ranked by VARBusiness magazine as one of its Top 50 Fastest-Growing Solution Providers. Additional information on ManTech can be found at www.mantech.com.

Forward-Looking Information:

Statements and assumptions made in this press release, which do not address historical facts, constitute "forward-looking" statements that ManTech believes to be within the definition in the Private Securities Litigation Reform Act of 1995 and involve risks and uncertainties, many of which are outside of our control. Such forward-looking statements are subject to factors that could cause actual results to differ materially from those anticipated results. These factors include but are not limited to: the failure of the government to allot funds to ManTech to complete performance of the contact or exercise contract options; the risk of contract performance; government contract procurement (such as bid protest) and termination risks; competitive factors such as pricing pressures and/or competition to hire and retain employees; and material changes in laws or regulations applicable to the company's businesses. These and other risk factors are more fully discussed in the section entitled "Risks Related to the Company's Business" in ManTech's Annual Report on Form 10-K filed with the Securities and Exchange Commission on March 16, 2005, and, from time to time, in ManTech's other filings with the Securities and Exchange Commission, including among others, its reports on Form 10-Q and Form 8-K. The forward-looking statements included in this news release are only made as of the date of this news release and ManTech undertakes no obligation to publicly update any of the forward-looking statements made herein, whether as a result of new information, subsequent events or circumstances, changes in expectations or otherwise.