ManTech Awarded $10.5 Million Contract from the Transportation Security Administration to Support Alien Flight School Program.

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 was awarded a contract from the Department of Homeland Security, Transportation Security Administration (TSA) to provide analytic services for the vetting of non-U.S. citizens requesting flight training in the United States. The five-year, $10.5 million contract was competitively awarded.

The TSA's Alien Flight School Program (AFSP) is designed to prevent terrorists from receiving pilot training from flight schools. As a prerequisite to flight training, non-U.S. citizens must provide TSA with fingerprints, biographical information, including full name, passport and visa information - and training specifics such as the type of aircraft the candidate seeks instruction to operate.

"ManTech has broad experience in intelligence analysis, and we will apply those skills, and our knowledge of the AFSP to make this effort successful for TSA," said Robert A. Coleman, President and Chief Operating Officer, ManTech International Corporation.

ManTech professionals will assist TSA in reviewing alien candidate applications, working with a variety of databases to cross reference and characterize potential risks. ManTech assisted TSA in the development of acceptable techniques, processes and procedures necessary to implement the Congressional directives associated with the AFSP.

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 over 6,000 highly qualified employees, the company operates in the United States and 38 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.