ManTech Awarded $12.9 Million, Shipboard Advanced Radar Target Identification Systems --SARTIS-- Contract from the Naval Air Warfare Center Aircraft Division.

Business Editors/High-Tech Writers

FAIRFAX, Va.--(BUSINESS WIRE)--April 22, 2004

Five-Year Contract Will Provide Engineering and Technical Support for Combat Identification and Air Traffic Control Systems

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 Department of Defense and other federal government customers announced today that it has been awarded a contract from the U.S. Naval Air Warfare Center Aircraft Division (NAWCAD), to provide engineering and technical services for non-cooperative target recognition, non-cooperative target identification, and other combat identification and air traffic control systems.

NAWCAD is part of the Naval Air Systems Command (NAVAIR). It supports the design, development, integration, test and evaluation, installation, fielding, certification, maintenance, and logistics for Navy electronic combat identification equipment, systems and subsystems. This contract will provide engineering and technical services to the NAWCAD Identification Systems Division supporting combat identification and air traffic control systems. The systems supported include the AN/UPX-34A(V), central identification friend or foe, automatic identification, and control approach radar systems.

"We are supporting some very sophisticated systems," said Kenneth J. Farquhar, President, ManTech Systems Engineering Corporation. "The fact that we are a Software-CMM Level 3 company has helped us to apply very rigorous software procedures and has contributed to our ability to successfully support this customer for the past ten years. These skills and our experience will allow us to continue to provide a high-level of support to NAVAIR in the future," he said.

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 Department of Defense 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. With annual revenues in excess of $700 million and more than 5,000 highly qualified employees, the company operates in the United States and over 30 countries worldwide. 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, could be interpreted to be "forward-looking" statements that ManTech believes to be within the definition in the Private Securities Litigation Reform Act of 1995. Such 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 statement include, but are not limited to: the failure of the Government to allot funds to ManTech to complete performance of the contact; 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 titled "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.