TASC, Inc., formerly known as The Analytic Sciences Corporation, Inc., is an American private defense contractor based outside Washington, D.C., in Chantilly, Virginia. Northrop Grumman owned TASC from 2001 to 2009, when it sold the unit to comply with new government conflict of interest rules. In February 2015, Engility Holdings, Inc. announced that it had completed its acquisition of TASC, Inc. in an all-stock transaction valued at approximately $1.3 billion, including the assumption of net debt.