ELLSWORTH AIR FORCE BASE, S.D. -- Munitions and B-1B Lancers are lined up on the flightline preparing for missions, April 8. 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)