ManTech Awarded $4 Billion PRIME 3.2 Multiple Award Blanket Purchase Agreement From the U. S. Agency for International Development.

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; the Departments of Defense, State, Homeland Security, and Justice; the Space Community; and other U.S. federal government customers, announced today that it has received a $4 billion blanket purchase agreement (BPA) from the United States Agency for International Development (USAID). ManTech is one of five awardees of the Principle Resources for Information Management Enterprise-wide (PRIME) 3.2 BPA. The objective of the PRIME 3.2 BPA is to deliver a broad range of high-end technology solutions that enable USAID and its foreign affairs partners to efficiently and economically meet their mission objectives both domestically and internationally.

Under PRIME 3.2, the ManTech team will have the opportunity to deliver innovative and effective solutions across the full spectrum of information technology support, from system architecture and design to end user system implementation and customer support for USAID and its development partners. The contract period of performance is one base year plus four options.

"This win is a key part of our strategy to expand our market focus to new customers and agencies by leveraging and extending the high-tech solutions developed for our Intelligence and DOD community customers. This multi-billion dollar, multi-agency contract vehicle provides us the opportunity to leverage our global presence to support USAID and its mission partners overseas and domestically - in times of war and peace. Our prime position and outstanding team of large and small industry partners demonstrates our leadership in this space," said Robert A. Coleman, President and Chief Operating Officer, ManTech International Corporation.

"Our proven capabilities used to support our Intelligence, Department of Defense and State Department customers have great applicability to the USAID mission. In addition, our worldwide presence in 44 countries is a discriminator in our ability to fulfill this customer's expanding requirements," said George J. Pedersen, Chairman and Chief Executive Officer, ManTech International Corporation.

ManTech's team consists of highly talented partners including Booz Allen Hamilton; Allied Technology Group, Inc.; Atlantic CommTech Corporation; Geneva Software Company, Inc.; Glotech Incorporated; Mercom; Ibex; and American Systems Corporation. In addition, three technology enabling companies will support the ManTech team for the PRIME 3.2 BPA: Cisco Systems, Inc., Microsoft Corporation, and Sprint Nextel Corporation.

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; 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 over 6,000 highly qualified employees, the company operates in the United States and 44 countries worldwide. In 2005, Red Herring magazine selected ManTech as one of its Small Cap 100 Companies. Additional information on ManTech can be found at www.mantech.com.

About USAID

USAID is an independent agency that has provided economic and humanitarian assistance worldwide for more than 40 years. For more information about USAID, visit www.usaid.gov.

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; 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 "Item 1A. - Risk Factors" in ManTech's Annual Report on Form 10-K filed with the Securities and Exchange Commission on March 10, 2006, 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.