ManTech Establishes Department of Homeland Security Mentor-Protege Agreement with Infinite Group, Inc.

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 it will sponsor Infinite Group, Inc. (OTCBB:IMCI), a government-designated small business, under the Department of Homeland Security (DHS) Mentor-Prot[R] g[R] program.

ManTech will provide technical and management assistance to Infinite Group, Inc. (IGI), Pittsford, NY, for business development and the expansion of IGIeIUs proposal development methodology and organization. ManTech will assist in other mentoring activities such as marketing, market analysis and government contracts support, administration, performance and execution. IGI will also have the opportunity to participate in training programs involving program and project management, and proposal writing and capture management through highly regarded ManTech University.

In addition to IGI, ManTech has Mentor-Prot[R] g[R] relationships with six other small businesses involving Department of Defense and civilian agencies.

"Being selected by ManTech to participate in the DHS Mentor-Prot[R] g[R] Program is a great honor for our company," said Michael Smith, IGIeIUs President and CEO. "ManTech has an excellent reputation at DHS and they have done some superb work there such as helping to develop the Integrated Common Analytic Viewer, a geospatial intelligence tool. We look forward to working closely with ManTech in developing new business opportunities at DHS. We view this as a true partnership where both parties will work together to enhance each othereIUs mutual interests."

The DHS Mentor-Prot[R] g[R] Program is designed to motivate and encourage large business prime contractors to provide mutually beneficial development assistance to small businesses, veteran-owned small businesses, and women-owned small business concerns. The program is also designed to improve the performance of DHS contracts and subcontracts, foster the establishment of long-term business relationships between DHS large prime contractors and small business subcontractors, and strengthen subcontracting opportunities and accomplishments at DHS.

"ManTech is a strong supporter of small businesses and mentor-prot[R] g[R] programs," said Robert A. Coleman, President and COO, ManTech International Corporation. "When small businesses are successful and grow, it strengthens our whole industry. We derive as much benefit from working with small business as our partners - and Infinite Group, Inc. is the kind of small business that we pride ourselves in sponsoring."

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 Departments of Defense, State, Homeland Security, and Justice; the Space Community; and other U.S. federal government customers. ManTecheIUs 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. The company operates in the United States and over 40 countries worldwide. In 2005, Red Herring magazine selected ManTech as one of its Small Cap 100 Companies; and in 2006, Business 2.0 magazine named ManTech one of its 100 Fastest Growing Technology Companies. Additional information on ManTech can be found at www.mantech.com.

About Infinite Group, Inc.

Infinite Group, Inc. provides business and technology solutions, portfolio, program and project management, communications interoperability, network services and biometric technologies to federal, state and local governments, as well as commercial clients. IGI is an expert in designing and aligning business processes with technology, for the delivery of tailored solutions that meet clientseIU needs. With offices in Pittsford, New York; Vienna, Virginia; and Jackson, Mississippi, IGI is able to facilitate and execute mission-critical business solutions for our national clients. IGI provides these services through direct prime contracts, as well as in association with other selected System Integrators. Additional information on IGI can be found at www.us-igi.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. 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 10, 2006, 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.