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

CACI Awarded Prime Position on Commercial Enterprise Omnibus Support Services Blanket Purchase Agreement With Marine Corps

$500 Million-Ceiling Contract Supports Marine Corps Acquisition Activities

Arlington, VA, September 16, 2008 - CACI International Inc (NYSE:CAI) announced today that it has been awarded a contract to provide engineering and scientific support to the Marine Corps System Command (MCSC) Acquisition Center for Support Services (ACSS) as one of ten prime positions on the Commercial Enterprise Omnibus Support Services (CEOss) blanket purchase agreement. Engineering and Scientific support services are one of four domains into which ACSS activities are grouped. CACI currently supports the ACSS as subcontractor on the three other domains – Specialty Engineering; Business and Analysis; and Acquisition, Logistics, and Administrative support – and this prime award represents new business for the company. The CEOss contract is open to all Marine Corps organizations and has an estimated ceiling value of $500 million.

Under the direction of the MCSC, the ACSS provides end-to-end procurement services, which include planning and supporting all facets of weapons systems acquisition, life cycle management, and post-deployment logistics support for the Marine Corps.

CACI has supported the ACSS since the inception of the CEOss contract in 2002. Examples of the company's service include providing acquisition support for the development of mine-resistant ambush-protected (MRAP) vehicles and supporting a paperless acquisition system for the Marine Corps' logistics program. CACI offers ACSS the benefits of this experience, as well as the expertise gained through extensive engineering experience with the U.S. Army and Navy, to ensure projects are completed effectively and on time, enhancing support for the warfighter. CACI's program management and systems engineering and technical assistance (SETA) core competency has significant value for the ACSS's Engineering and Scientific support domain, and all CACI core competencies have relevance to the four broad CEOss domains.

Bill Fairl, CACI's President of U.S. Operations, said "With a team of seasoned professionals already familiar with Marine Corps requirements in multiple acquisition domains, CACI offers a reduced learning curve and proven engineering and scientific expertise. Our solutions will help ensure that Marine Corps warfighters receive the support they need when they need it."

According to CACI President and CEO Paul Cofoni, "CACI's prime position on the $500 million Commercial Enterprise Omnibus Support Services contract with the Marine Corps illustrates our success in executing on CACI's strategic plans. We're focused on winning large contracts, like CEOss, that position us to expand the innovative and high-value services and solutions we provide for our nation's most critical missions."

CACI International Inc provides the professional services and IT solutions needed to prevail in today's 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. We add value to our clients' operations, increase their skills and capabilities, and enhance their missions. CACI is a member of the Fortune 1000 Largest Companies of 2007 and the Russell 2000 index. CACI provides dynamic careers for approximately 12,200 employees working in over 120 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; changes in interest rates; currency fluctuations; 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; 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; 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, (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; 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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Corporate Communications and Media:

Jody Brown, Executive Vice President, Public Relations

(703) 841-7801, jbrown@caci.com

Investor Relations:

David Dragics, Senior Vice President, Investor Relations

(866) 606-3471, ddragics@caci.com