News Release
CACI International Inc 1100 North Glebe Road Arlington Virginia 22201
www.caci.com

CACI Recognized by Association for Corporate Growth for Deal of the Year
American Management Systems Defense and Intelligence Group Acquisition Lauded

Arlington, VA, May 5, 2005 CACI International Inc (NYSE:CAI) announced today that it has received the "Deal of the Year Award" by the National Capital chapter of the Association for Corporate Growth. CACI won the award for its acquisition of the Defense and Intelligence Group of American Management Systems (AMS) at a ceremony hosted by the group in McLean, Virginia.

According to ACG, the "Deal of the Year Award" is presented to the regional company that was a party to the most outstanding transaction of those nominated. A deal is defined as a public or private financing, an acquisition, merger, or divestiture. Selection criteria include quantitative factors such as the value of the transaction, its impact on shareholder value and market share and subjective consideration of the transaction's impact on our region. Other nominees included Argon ST Reverse Merger and Inphonic IPO.

Founded in 1954, the Association for Corporate Growth is a global association for professionals involved in corporate growth, corporate development, and mergers and acquisitions. Today ACG stands at more than 9,000 members from corporations, private equity, finance, and professional service firms representing Fortune 500, Fortune1000, FTSE 100, and mid-market companies in 46 chapters in North America and Europe.

CACI's acquisition of the Defense and Intelligence Group of AMS was the largest in the company's history. It brought approximately 1,650 new employees to CACI at eight major operating sites and increased the company's workforce by almost one quarter. The deal brought in more than 300 new contracts and approximately $250 million in revenue, including significant new business with the Department of Defense, U.S. Navy, and members of the intelligence community — core businesses for CACI.

"This acquisition was tailor-made for us and enhanced CACI's growth plan. It proved to be successful across the board. It was a great fit," said CACI Chairman, President, and CEO Dr. J.P. (Jack) London. "We are proud to extend our service to the Department of Defense and look forward to working with this core group of clients for many years to come."

CACI International Inc provides the IT and network solutions needed to prevail in today's new era of defense, intelligence, and e-government. From systems integration and managed network solutions to knowledge management, engineering, simulation, and information assurance, we deliver the IT applications and infrastructures our federal customers use to improve communications and collaboration, secure the integrity of information systems and networks, enhance data collection and analysis, and increase efficiency and mission effectiveness. Our solutions lead the transformation of defense and intelligence, assure homeland security, enhance decision-making, and help government to work smarter, faster, and more responsively. CACI, a member of the Russell 2000 and S&P SmallCap 600 indices, provides dynamic careers for approximately 9,500 employees working in over 100 offices in the U.S. and Europe. CACI is the IT provider for a networked world. Visit CACI on the web at www.caci.com.

There are statements made herein which do not address historical facts and, therefore could be interpreted to be forward-looking statements as that term is defined 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 anticipated include, but are not limited to, the following: regional and national economic conditions in the United States and the United Kingdom, including conditions that result from terrorist activities or war; failure to achieve contract awards in connection with recompetes for present business and/or competition for new business; the risks and uncertainties associated with client interest in and purchases of new products and/or services; continued funding of U.S. government or other public sector projects in the event of a priority need for funds, such as homeland security, the war on terrorism or rebuilding Iraq; government contract procurement (such as bid protest, small business set asides, etc.) and termination risks; the results of government investigations into allegations of improper actions related to the provision of services in support of U.S. military operations in Iraq; the results of the appeal of CACI International Inc ASBCA No. 53058; individual business decisions of our clients; paradigm shifts in technology; competitive factors such as pricing pressures and/or competition to hire and retain employees (particularly those with security clearances); material changes in laws or regulations applicable to our businesses, particularly in connection with (i) government contracts for services, (ii) outsourcing of activities that have been performed by the government, and (iii) competition for task orders under Government Wide Acquisition Contracts ("GWACs") and/or schedule contracts with the General Services Administration; our own ability to achieve the objectives of near term or long range business plans; and other risks described in the company's Securities and Exchange Commission filings.

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For investor information contact:

David Dragics
Vice President, Investor Relations
(703) 841-7835
ddragics@caci.com

For other information contact:

Jody Brown
Executive Vice President, Public Relations
(703) 841-7801
jbrown@caci.com