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

CACI Forms Strategic Alliance with Riverbed to Enhance Performance of U.S. Government's Information Technology Services Worldwide

Global Agreement Enables CACI Customers to Accelerate Wide Area Network Service Up to 100 Times While Improving Cost Efficiency

Arlington, VA, January 28, 2010 - CACI International Inc (NYSE:CACI) announced today it has completed comprehensive Reseller and Master Service agreements with Riverbed Technology, the IT infrastructure company for networks, applications, and storage. The strategic alliance will enable CACI to significantly enhance the ability of customers to increase productivity with dramatically accelerated wide area network (WAN) operations and improved cost efficiency. With this partnership, CACI will serve as both a vendor and integrator of Riverbed® technology, providing a comprehensive offering of Riverbed's industry leading solutions to customers with a full array of integration and support services.

Riverbed has been recognized as a leading provider of WAN acceleration technology by the world's foremost information technology research and advisory company. The company's solutions speed up access to applications and data, in some cases by up to 100 times. This increased communications bandwidth allows organizations to achieve higher productivity for offices worldwide by dramatically shortening transmission, backup, and replication times and offers the ability to transmit a wider array of data. In addition, the capability of transmitting more data through existing networks enables customers to increase cost efficiency by delaying upgrades while making optimum use of their networks.

CACI will integrate the optimum Riverbed equipment suites in the development of tailored solutions for customers' specific applications and support these installations with full customer service support worldwide. WAN acceleration is a critical component for solutions required by CACI's customers, especially in the defense and intelligence communities. Leveraging this capability will be key to helping agencies throughout the government achieve mission success in everything from enabling real-time video for in-theater operations, to increasing the speed of some applications by a factor of nearly one hundred times, to consolidating data centers and boosting bandwidth for personnel in remote areas.

Bill Fairl, CACI's President of U.S. Operations, said "We're proud that CACI's enterprise and IT services functional core competency offers an array of innovative capabilities that help improve performance for our customers. Our partnerships with world-class technology providers enhance our ability to meet the government's evolving need for full solution offerings that deliver faster, more efficient operations."

According to CACI President and CEO Paul Cofoni, "Today, every federal agency has been asked to do more with the resources at their disposal, continuing ongoing transformation initiatives. We're very pleased that through strategic alliances, CACI is able to provide our customers with wide ranging solutions that include communicating information securely on the battlefield to working with civil agencies to increase efficiency and improve service to citizens."

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 12,800 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; 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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