ManTech and Texas State University to Collaborate on Computer Forensics.

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 it has signed an agreement with Texas State University-San Marcos to develop a computer forensics curriculum, applications for research and internship programs. The relationship may also lead to the pursuit of cooperative business opportunities.

Texas State officials will work with ManTech's computer forensics and intrusion analysis business unit to build practical applications for their research that can be applied and used on a daily basis. They will also develop a computer forensics curriculum, as part of their computer science department offerings.

Dr. Moonis Ali, Chair of the Computer Science Department, Texas State University-San Marcos said, "We are excited about finding common research interests where we can collaborate. An industry partner allows us an insight into trends in the field that we do not regularly see. ManTech has highly-skilled computer security professionals and an excellent reputation in the field."

ManTech's computer forensics and intrusion analysis unit provides services to the Intelligence Community, Department of Defense, civilian government agencies and commercial customers - including law firms. The majority of their work supports highly sensitive critical national security programs.

"Our computer forensics unit is one of the most sophisticated and advanced technology groups in our marketplace," said Gary Dorland, President of ManTech Security and Mission Assurance. "Joining with a highly-regarded university program will allow us to influence their computer security curriculum, which will hopefully produce more graduates with skills in this high-demand, advanced technology area."

The Department of Computer Science at Texas State University has approximately 400 undergraduate majors in Computer Science, and more than 150 graduate majors. Students have access to a large number of computing platforms ranging from mainframes to personal computers and workstations running various operating systems with a wide range of applications software. The department also has an Industry Advisory Board of approximately 45 chief executive officers, vice presidents, or top management from computer companies. Texas State's Bachelor of Science in Computer Science program is accredited by the Accreditation Board for Engineering and Technology. This nationally recognized accreditation is currently held by only 196 computer science programs out of 3,000 nationwide. These accredited programs include MIT and Berkeley.

According the U.S. Department of Labor, Bureau of Labor Statistics, "demand for computer security specialists will grow as businesses and government continue to invest heavily in cyber security, protecting vital computer networks and electronic infrastructures from attack."

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.