U.S. Air Force Staff Sgt. David Lewis, a load crew member with the 509th Maintenance Squadron, loads a GBU-31 joint direct attack munition and a Mark 84 munition in a B-2 Spirit aircraft Feb. 21, 2014, at Whiteman Air Force Base, Mo. USAF; Airman; Whiteman AFB; GBU-31 joint direct attack munition; Mark 84 munition