U.S. Air Force Staff Sgt. Jonathon Hill, 28th Aircraft Maintenance Squadron aerospace propulsion journeyman, Ellsworth Air Force Base, S.D., tries to cease a hydraulic pump underneath a B-1B Lancer during Red Flag 12-2 Jan. 24, 2012, at Nellis AFB, Nev. Red Flag is a realistic combat training exercise involving the air forces of the United States and its allies. The exercise is hosted north of Las Vegas on the Nevada Test and Training Range. (U.S. Air Force photo by Senior Airman Brett Clashman)