CACI International Inc. is an American multinational professional services and information technology company headquartered in Northern Virginia. CACI provides services to many branches of the US federal government including defense, homeland security, intelligence, and healthcare. CACI has approximately 23,000 employees worldwide. CACI is a member of the Fortune 1000 Largest Companies, the Russell 2000 index, and the S&P MidCap 400 Index. Wikipedia