ELLSWORTH AIR FORCE BASE, S.D. -- (Left to right) Airmen 1st Class Aaron Valdez, Derrick Scott, Senior Airman Myco Wilson and Airman 1st Class Michael DiRienzo, 28th munitions Squadron conventional maintenance crew members, put together several inert Guided Bomb unit-31, Dec. 8. Inert GBU-31 bombs are designed for training missions with the B-1B Lancer. (U.S. Air Force photo/Airman 1s Class Anthony Sanchelli)