ManTech Awarded $3.8 Million Contract to Support Army Criminal Investigation Command, Computer Crime Investigative Unit.

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 $3.8 million dollar contract with the U.S. Army Criminal Investigation Command, Computer Crime Investigative Unit. ManTech will provide technical and analytical support to felony criminal investigations pertaining to intrusions into Army networks and perform vulnerability assessments for the Army information assurance program.

The competitively awarded contract has a base-year with four option years, for a total potential value to ManTech of $3.8 million. Services provided by ManTech under the contract include computer forensic analysis, vulnerability assessments, information assurance program management assistance, and information security support.

"ManTech is pleased to be selected by the United States Army Criminal Investigation Command, Computer Crime Investigative Unit, to contribute our vast leading-edge resources and knowledge-base, as well as our intellectual product offerings to the important mission of the Computer Crime Investigative Unit," said Eugene C. Renzi, ManTech Senior Executive Vice President, and President of ManTech's Defense Systems Group. "Computer forensic analysis, vulnerability assessments and information assurance are some of ManTech's core competencies and we have helped many of our customers throughout the federal government respond to the rapidly escalating and evolving challenges in this area."

The U.S. Army Computer Crime Investigative Unit has two primary missions: criminal investigations concerning network intrusions and crime prevention using vulnerability assessments that identify crime-conducive conditions. They develop linkages between adversary actions and friendly protective measures, particularly those concerning force protection, information assurance, and counter-terrorism directed at or related to the Army.

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.