Two B-1B Lancers assigned to the 37th Bomb Squadron, Ellsworth Air Force Base, S.D., taxi during Red Flag 15-2 at Nellis AFB, Nev., March 10, 2015. Red Flag provides a series of intense air-to-air scenarios for aircrew and ground personnel to increase their combat readiness and effectiveness for future real-world operations. (U.S. Air Force photo by Staff Sgt. Siuta B. Ika)