Four F-16 Fighting Falcons prepare to launch during Red Flag 15-1 Jan. 26, 2015, at Nellis Air Force Base, Nev. Red Flag is a realistic combat exercise involving U.S. and allied air forces conducting training operations on the 15,000 square mile-Nevada Test and Training Range. The F-16s are assigned to the 175th Fighter Squadron, Joe Foss Air National Guard Station, Sioux Falls, S.D. (U.S. Air Force photo/Staff Sgt. Siuta B. Ika)