Royal Saudi Air Force Staff Sgt. Hassan, crew chief, waits to marshal an F-15 Strike Eagle before a training mission during Red Flag 12-2 Jan. 25, 2012, at Nellis Air Force Base, 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)