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

CACI - National Security Research, Inc. Receives National Capital Region Ethics Award
Newest Acquisition Is Recognized for Ethical Business Practices

Arlington, VA, October 25, 2005 — CACI International Inc (NYSE:CAI) announced today its newly acquired National Security Research, Inc. (NSR) has been awarded the 2005 National Capital Region Ethics Award for Mid-Size Companies. The National Capital Business Ethics Awards are presented annually by the Greater Washington and Northern Virginia Chapters of the Society of Financial Service Professionals, in partnership with George Mason University. The awards recognize businesses outside the financial services industry that exemplify a strong commitment to business excellence and the highest standards of civic and social responsibility, integrity, and ethical conduct. CACI completed its acquisition of NSR on October 17.

NSR brings CACI a range of services and solutions in the command and control, homeland security, advanced concepts and international security, and missile defense markets. CACI's acquisition of NSR represents a strategic integration of capabilities that support CACI's target growth areas in homeland security and national priorities in the global war on terrorism.

Paul Cofoni, CACI's President of U.S. Operations, said, "CACI is excited to see our newest team members receive the National Capital Region Ethics Award. This recognition demonstrates their exceedingly good fit with our corporate culture. All of us at CACI remain vigilant on behalf of our clients, shareholders, and employees, and place the greatest emphasis on mutual respect and trust among ourselves and our clients, our belief in individual accountability, and our commitment to excellence in everything we say and do."

Dr. J.P. (Jack) London, CACI Chairman, President, and CEO, said, "By focusing our mergers and acquisition (M&A) program on companies whose values mirror our own, CACI has been able to support our growth goals while sustaining an outstanding reputation for quality client service and best value. Our M&A track record is confirmed time and again as we continue to add top performers like National Security Research, Inc. to the CACI family. These new team members bring strong capabilities in support of our mission to help the highest levels of government meet requirements for national security and homeland defense."

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 1000 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; changes that could result from accounting adjustments requested in connection with finalizing our Report on Form 10-K; and other risks described in the company's Securities and Exchange Commission filings.

# # #

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