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

CACI Reports Record Fiscal 2010 Second Quarter Results

Diluted earnings per share increased 25.2 percent to $0.85
Revenue increased 15.5 percent to $776.7 million, driven by 13 percent organic growth
Contract funding orders increased 11.2 percent to $599 million
Raised annual guidance

Arlington, VA, January 27, 2010 - CACI International Inc (NYSE:CACI), a leading professional services and information technology solutions provider to the federal government, announced results today for its second fiscal quarter ended December 31, 2009.

We are pleased to report record net income of $26.1 million for the second quarter of Fiscal Year 2010 (FY10). This was a 26.1 percent increase over the same period last year. The 15.5 percent increase in revenue in the quarter was driven by organic growth of 13.0 percent, reflecting the continued strong performance of our defense and intelligence businesses.

Commenting on the company's financial results, Paul Cofoni, CACI's President and CEO, said, "Our strong results this quarter were driven by successful implementation of our strategy to provide mission-critical services in support of well-funded national security priorities, as well as a significantly lower tax rate. We continued to meet our financial goals of double-digit earnings growth and mid to high single-digit organic revenue growth while generating strong cash flows. We experienced growth in all of our core competencies, with the strongest increase in C4ISR Solutions. Funding orders increased notwithstanding that the government operated under a continuing resolution during most of the quarter. We are pleased to announce we are raising our Fiscal Year 2010 guidance. We reaffirm our commitment to delivering superior results for our shareholders."

Second Quarter Results

Net income and diluted earnings per share grew as a result of growth in operating income, reduced net interest expense and a lower corporate tax rate due primarily to the performance of investments in CACI's deferred compensation plan.

Additional Financial Metrics

Second Quarter Contract Funding Orders and Awards

• Contract funding orders were $599 million, an 11.2 percent increase over the second quarter of FY09. Funded backlog was $1.75 billion, a 14.5 percent increase over the second quarter of FY09.
• We received contract awards with an estimated value of $561 million including:
• A $190 million award from the U.S. Navy to provide technical services to support the Fleet Assistance and Shipboard Training (FAST) program for the Navy and the U.S. Marine Corps.
• An $81 million task order from the U.S. Army to support the Base Realignment and Closure (BRAC) transition of C4ISR operations to Aberdeen Proving Ground, Maryland.
• A $31 million award from the Department of Defense (DoD) Business Transformation Agency for program management support for the implementation of a financial management database system to the Office of the Secretary of Defense and Other Defense Agencies.
• Approximately $100 million in previously unannounced awards from the Intelligence Community.

Second Quarter Recognition

• CACI was named Government Contractor of the Year for companies with revenue greater than $300 million at the 7^th Annual Greater Washington Government Contractor Awards event.
• CACI was named one of GI Jobs magazine's Top 100 military-friendly employers for 2009.

CEO Commentary

Mr. Cofoni commented, "Recent events including the 'Christmas Bomber' attempt, the suicide attack on CIA employees in Afghanistan, the Ft. Hood shootings, and the cyber attacks on Google and other large companies show that threats to our national security continue. These underscore the continuing need for the services we provide our government customers. With the signing of the FY10 budget in late December, we expect continued strong funding in the key areas in which we operate and the pace of awards to increase for the remainder of our fiscal year. Consistent with our strategy to be a strategic consolidator through prudent deployment of our capital, this quarter we have completed two acquisitions, one in the U.K., which provides web enablement services, and one domestically, which provides commercial security technology. We also announced an agreement to acquire SystemWare, Inc., which provides unique solutions for cybersecurity and counterintelligence applications. Cybersecurity is also the topic of our next Asymmetric Threat Symposium in March, co-sponsored with the United States Naval Institute. We continue to collaborate with other thought leaders to advance the state of thinking on countering asymmetric threats. Looking forward, we are confident in our ability to deliver double-digit earnings growth and mid to high single-digit organic revenue growth in FY10 and FY11 through the strong execution of our strategy."

First Half Results

Revenue in all of our core competencies grew with the strongest increase in C4ISR Solutions. Operating income increased in the first half as a result of solid growth in both direct labor and other direct costs.

Additional Financial Metrics

CACI Updates Its FY10 Guidance

We are updating our FY10 guidance. The table below summarizes the guidance ranges for FY10:

This guidance represents our views as of January 27, 2010. Investors are reminded that actual results may differ from these estimates for the reasons described below and in our filings with the Securities and Exchange Commission.

Conference Call Information

We have scheduled a conference call for 8:30 AM Eastern Time Thursday, January 28^th, during which members of our senior management team will be making a brief presentation focusing on second quarter results and operating trends followed by a question-and-answer session. You can listen to the conference call and view the accompanying exhibits over the Internet by logging on to our homepage, www.caci.com, at the scheduled time, or you may dial 1-877-627-6581 and enter the confirmation code 8683408. A replay of the call will also be available over the Internet beginning at 1:00 PM Eastern Time Thursday, January 28^th, and can be accessed through our homepage (www.caci.com) by clicking on the CACI Investor Info button.

About CACI

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 security; 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 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. CACI is the IT provider for a networked world. 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; changes in our effective tax rate; finalization of accounting for business combinations, including valuation of intangibles and contingent consideration; 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 audits 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, 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.

(Financial Tables follow)

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