A crew chief from the 34th Aircraft Maintenance Unit, Ellsworth Air Force Base, S.D., reviews aircraft maintenance forms and communicates with another crew chief in the cockpit of a B-1B Lancer assigned to the 34th Bomb Squadron, Ellsworth AFB, during Green Flag-West 15-02 at Nellis AFB, Nev., Nov. 18, 2014. Green Flag-West is a realistic air-land integration combat training exercise involving the air forces of the U.S. and its allies, is primarily conducted in conjunction with U.S. Army National Training Center exercises at Fort Irwin, Calif. (U.S. Air Force photo by Staff Sgt. Siuta B. Ika)