News Release CACI International Inc · 1100 North Glebe Road · Arlington Virginia 22201

CACI Announces Intent to Acquire SystemWare, Inc.

Acquisition to Expand CACI Capabilities in Counterintelligence and Cybersecurity

Arlington, VA, January 19, 2010 - CACI International Inc (NYSE:CACI) announced today that it has signed a definitive agreement to acquire SystemWare, Inc. SystemWare designs, manufactures, and provides state-of-the-art signals acquisition and analysis systems that enable users to monitor and detect cybersecurity and physical security vulnerabilities and enhance operational security. Closing is anticipated by February 1, 2010.

Founded in 1988, SystemWare is headquartered in Camarillo, California, near CACI's Oxnard facility, with East Coast operations directed from Elkridge, Maryland, where CACI also has a strong presence. More than half of the company's employees hold Secret-level security clearances and above, and its clientele includes the Department of Defense (DoD), the Intelligence Community, federal civilian agencies, and U.S. allies. SystemWare solutions include proprietary technologies that combine advanced software and analytical toolsets with cutting-edge, customizable hardware configurations to deliver industry-leading counterintelligence systems. Its quality management system has been awarded ISO 90002:2000 certification, assuring clients of high-quality software development. SystemWare's revenue in calendar year 2009 was $16 million. The acquisition is expected to be accretive to CACI's earnings per share during its first 12 months.

CACI President of U.S. Operations Bill Fairl said, "CACI is pleased to announce our intent to bring SystemWare, Inc. into the CACI family. As both a company and individual employees, SystemWare has an enviable, 20-year track record of dedicated national service. They will be a good match with our CACI culture of quality and excellence, and will expand CACI's ability to offer comprehensive and integrated solutions for our clients' most critical missions."

Paul Cofoni, CACI President and Chief Executive Officer, stated, "Our intent to acquire SystemWare, Inc. demonstrates CACI's continuing leadership as a strategic consolidator. We are committed to strategic growth that enhances national security, expands CACI capabilities, enhances our shareholder value, and increases our presence in important and well-funded markets."

SystemWare Chief Executive Officer Kelly Dunn said, "We are very enthusiastic about joining the CACI team. We believe SystemWare is a great fit with CACI, and our solutions will complement CACI's ability to provide additional offerings to our combined client base. At the same time, CACI's deep resources will enable us to expand our current support while sustaining the excellence on which we have built our company."

CACI provides professional services and IT solutions needed to prevail in the defense, intelligence, homeland security, and federal civilian government arenas. We deliver enterprise IT and network services; data, information, and knowledge management services; business system solutions; logistics and material readiness; C4ISR Solutions; cyber solutions; integrated security and intelligence solutions; and program management and SETA support services. CACI services and solutions help our federal clients provide for national security, improve communications and collaboration, secure the integrity of information systems and networks, enhance data collection and analysis, and increase efficiency and mission effectiveness. CACI is a member of the Fortune 1000 Largest Companies and the Russell 2000 index. CACI provides dynamic careers for approximately 12,700 employees working in over 120 offices in the U.S. and Europe. Visit CACI on the web at www.caci.com and www.asymmetricthreat.net.

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 a prolonged recession; terrorist activities or war; changes in interest rates; currency fluctuations; significant fluctuations in the equity markets; 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, based on a change in spending patterns, or in the event of a priority need for funds, such as homeland security, the war on terrorism or rebuilding Iraq; or an economic stimulus package; government contract procurement (such as bid protest, small business set asides, loss of work due to organizational conflicts of interest, 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 government audit and reviews conducted by the Defense Contract Audit Agency or other government entities with cognizant oversight; 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); market speculation regarding our continued independence; 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, (iii) competition for task orders under Government Wide Acquisition Contracts ("GWACs") and/or schedule contracts with the General Services Administration; and (iv) accounting for convertible debt instruments; the ability to successfully integrate SystemWare, Inc.’s operations; 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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