Leidos is a global science and technology solutions company providing scientific, engineering, systems integration, and technical services primarily to defense, intelligence, civil, and health sectors. It specializes in national security, health IT, aviation security systems like X-ray and CT scanners for airports, and engineering solutions. As a Fortune 500 company with over $16 billion in annual revenue, it holds a leading position in the defense industry's IT services following its 2016 merger with Lockheed Martin IS&GS.