Airman 1st Class Joseph Bak, 28th Munitions Squadron conventional maintenance crew member, assembles an inert guided bomb unit during an Operational Readiness Exercise at Ellsworth Air Force Base, S.D., March 19, 2013. The 28th MUNS Airmen are responsible for 1,707 munitions line items, 86 facilities and a 647–acre munitions storage area to support B-1 bomber operations. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)