ManTech Wins $200M AFCAP III Contract to Provide Worldwide Contingency Services to the U.S. Air Force.

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, and Justice; the Space Community; and other U.S. federal government customers, announced today that it was awarded a subcontract in the fourth quarter of last year to provide the U.S. Air Force with worldwide contingency services under the Air Force Contract Augmentation Program (AFCAP) III. The 10-year, indefinite-delivery, indefinite-quantity contract has a $10 billion ceiling. Six companies received awards for the competitively awarded effort, and they will vie for task orders under the program. ManTech is part of a team led by Readiness Management Support, a wholly-owned subsidiary of IAP Worldwide Services. The estimated contract value to ManTech is $200 million.

Operations and maintenance services provided by ManTech under AFCAP III cover radar systems, navigational aids, communications, IT and logistics systems. Under previous versions of the AFCAP contract, ManTech helped to develop a new air traffic control system in Afghanistan and currently provides a satellite communications capability at Kabul International Airport, one of the busiest International airports in the region.

"The AFCAP program is just one example of the support we provide to our customers in some of the most challenging locations all over the world," said Eugene C. Renzi, ManTech Senior Executive Vice President and President of ManTech's Defense Systems Group. "We are proud of the support provided by our employees for this critical Air Force system and the important role it plays in the global war on terrorism."

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, and Justice; the Space Community; 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 builds and maintains secure databases that track terrorists. With projected 2005 revenues of approximately $1 billion and over 6,000 highly qualified employees, the company operates in the United States and 38 countries worldwide. In 2004, ManTech was named one of Business Week magazine's Top 100 Hot Growth Companies. Last year, Red Herring magazine selected ManTech as one of its Small Cap 100 Companies. 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 anticipated results. The factors that could cause actual results to differ materially from those indicated by such forward-looking statements include but are not limited to: the failure of the government to award task orders to ManTech, allot funds to complete performance of the task orders awarded to ManTech, or exercise contract options; the risk of contract performance; government contract procurement (such as bid protest) and termination risks; failure to correctly estimate the indefinite-delivery, indefinite-quantity contracts, blanket purchase agreements or other indefinite value contracts; 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. For a discussion of these and other risks and uncertainties, please refer to 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.