Two F-22 Raptors taxi to the runway during Red Flag 15-1 Jan. 27, 2015, at Nellis Air Force Base, Nev. Red Flag is one of a series of advanced training programs administered by the U.S. Air Force Warfare Center, designed to increase combat readiness and effectiveness. The F-22s are assigned to the 94th Fighter Squadron from Joint Base Langley-Eustis, Va. (U.S. Air Force photo/Senior Airman Thomas Spangler)