Leidos Holdings, Inc., formerly known as Science Applications International Corporation, is an American defense, aviation, information technology, and biomedical research company headquartered in Reston, Virginia, that provides scientific, engineering, systems integration, and technical services. Leidos merged with Lockheed Martin's IT sector, Information Systems & Global Solutions, in August 2016 to create the defense industry’s largest IT services provider. The Leidos-Lockheed Martin merger is one of the biggest transactions thus far in the consolidation of the defense sector. Leidos contracts extensively with the Department of Defense, the Department of Homeland Security, and the Intelligence Community, as well as other U.S. government agencies and select commercial markets. Wikipedia