ELLSWORTH AIR FORCE BASE, S.D. -- A B-1B Lancer, with the 37th Bomb Squadron, flies over during a joint-nation training mission with Canadian joint terminal attack controllers in Alzada, MT, Oct. 28. Carrying the largest payload of both guided and unguided weapons in the Air Force inventory, the multi-mission B-1 is the backbone of America's long-range bomber force. (U.S. Air Force photo/Airman 1st Class Anthony Sanchelli)