ManTech Awarded $5.4 Million Contract from the Naval Supply Systems Command Fleet and Industrial Supply Center, Norfolk.

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 been awarded a follow-on contract from the Naval Supply Systems Command (NAVSUP) Fleet and Industrial Supply Center (FISC) in Norfolk, Virginia. The competitively awarded contract is for one-year, and has four option years for a total potential value to ManTech of $5.42 million.

ManTech will provide FISC Norfolk with program management, trend analysis, problem solving, financial analysis, and system support alternatives associated with U.S. Navy Property, Plant and Equipment (Personal Property) management. Other services include quality, analytical, and non-personnel logistics services support to implement and maintain Property Management Systems, including the Defense Property Accountability System.

"Our ongoing support of the NAVSUP FISC program provides the Navy with important logistics support services and products," said Ken Farquhar, President of ManTech Systems Engineering Corporation. "ManTech's expertise in logistics and financial management is fundamental to the services we provide the FISC Norfolk group."

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 over 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.

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 "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 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.