Virginia Air National Guard Master Sgt. Russell Tilley, 192nd Maintenance Squadron aerospace propulsion technician, performs pre-test inspections on a Pratt and Whitney F119 engine at Langley Air Force Base, Va., July 22, 2015. The engine of the F-22 Raptor produces more thrust than any other current fighter jet engine. (U.S Air Force photo by Airman 1st Class Derek Seifert/Released)