ManTech Awarded $2.4 Million Contract From the Department of Health and Human Services to Help States Respond to Bioterrorism.

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 it has received a $2.4 million contract from the Department of Health and Human Services (DHHS), Health Resources and Services Administration. Under the competitively awarded contract, which runs through December 2006, ManTech will support the development of Technical and Policy Guidelines, Standards, and Definitions for the Emergency System for Advance Registration of Volunteer Health Professionals (ESAR-VHP). These guidelines will be used to develop state-based registries of volunteer health professionals who can be "called-up" in times of a declared emergency.

States which participate in the National Bioterrorism Hospital Preparedness Program are expected to comply with the ESAR-VHP guidelines. In addition to supporting the development of the guidelines, ManTech will also provide technical assistance to states who are participating in the program.

"DHHS is a new customer for ManTech," said George J. Pedersen, Chairman of the Board and CEO, ManTech International Corporation. "While the majority of our work involves providing advanced technology solutions to the Intelligence Community and the Department of Defense, this contract will help us to broaden our involvement supporting the U.S. government in the war against terrorism."

ManTech's teammates on the program are Collaborative Fusion, the American Medical Association, and the Joint Commission Resources (an affiliate of the Joint Commission on Accreditation of Healthcare Organizations).

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. The company's expertise includes 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 annual revenues in excess of $700 million and more than 5,300 highly qualified employees and several thousand consultants, the company operates in the United States and more than 30 countries worldwide. ManTech was selected by Business Week magazine as one of the Top 100 Hot Growth Companies for 2004. Also this year, VARBusiness magazine ranked ManTech 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. Words such as "may," "will," "intends," "should," "expects," "plans," "projects," "anticipates," "believes," "estimates," "predicts," "potential," "continue," or "opportunity," or the negative of these terms or words of similar import are intended to identify forward-looking statements. These forward-looking statements are subject to known and unknown risks and uncertainties, which could cause actual results to differ materially from those anticipated, including, without limitation: adverse changes in U.S. government spending priorities; failure to retain existing U.S. government contracts or win new contracts; failure to obtain option awards, task orders, or funding under contracts; risks of contract performance; risks of contract termination, either for default or for the convenience of the U.S. government; adverse results of U.S. government audits of our U.S. government contracts; risks associated with complex U.S. government procurement laws and regulations; failure to experience favorable results from acquisition synergies; 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 8-K and Form 10-Q. 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.