ManTech Awarded $13.5 Million Contract to Provide Training and Logistics Support Services at Fort Knox.

FAIRFAX, Va. -- ManTech International Corporation (Nasdaq:MANT), a leading provider of innovative technologies and solutions focused on mission-critical national security programs for the Department of Defense, the Intelligence Community, the Department of State, the Department of Justice, the Department of Homeland Security and other U.S. federal government customers, announced today that it has been awarded a $13.5 million contract to support the U.S. Army Directorate of Plans, Training and Mobilization, Fort Knox, Kentucky. ManTech will provide services for training and facilities management activities. Fort Knox is home to the U.S. Army Armor Center, Armor School and other units.

The competitively awarded contract has a one-year base, and four, one-year, option years - for a total potential value to ManTech of $13.5 million. ManTech will support facilities management, logistics operations and training at Fort Knox- which includes the Army's sophisticated Urban Warfare Training Center. Under the contract, ManTech is a subcontractor to EPS, a New Jersey company that provides global technology, security and network solutions. The training center is an automated, state-of-the-art depiction of a small city, complete with collapsing bridges and "blow-out" roofs that help soldiers to prepare for urban conflicts.

"This contract allows us to expand our work at Fort Knox, particularly in training support," said Eugene C. Renzi, President of ManTech's Defense Systems Group. "Facilities such as Fort Knox, which offers training for urban warfare, are providing critical services as our armed forces personnel wage battles in many urban environments around the world. We are proud to support this effort which plays a vital role in our nation's national security."

In addition to the training support activities at Fort Knox, ManTech also provides training in information system security for a variety of organizations in the Department of Defense and the Intelligence Community, and other training for the Navy, Army Space and Missile Defense Command, Air Force Air Combat Command, Defense Logistics Agency and the Defense Information Systems Agency.

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 Department of Defense, the Intelligence Community, the Department of State, the Department of Justice, the Department of Homeland Security and other U.S. federal government customers. ManTech's expertise includes 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. Marshall Service deploy a common, office automation system. With projected annual revenues in excess of $800 million for 2004 and more than 5,500 highly qualified employees and several thousand consultants, the company operates in the United States and more than 30 countries worldwide. In 2004, ManTech was selected by Business Week magazine as one of the Top 100 Hot Growth Companies and was ranked as one of the Top 50 Fastest-Growing Solution Providers by VARBusiness magazine. 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 U.S. government to allot funds to ManTech to complete performance of the contract or exercise contract options; risks of contract performance; risks of contract termination, either for default or for the convenience of the U.S. government; risks associated with complex U.S. government procurement laws and regulations; 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 15, 2004, 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.