ELLSWORTH AIR FORCE BASE, S.D. - Capt. Patrick Mullen, 37th Bomb Squadron pilot, exits a B-1B Lancer during an engine-running crew change, Oct. 27. The B-1 is a highly versatile, multi-mission weapon system which carries the largest payload of both guided and unguided weapons of any aircraft in the Air Force inventory. (U.S. Air Force photo/Staff Sgt. Marc I. Lane)