Staff Sgt. Rob Tingle, 373rd Training Squadron Detachment 12 electro-environmental systems instructor, shows congressional staff delegates a C-17 Globemaster III aircraft maintenance training simulator during a base visit April 21, 2014, at Joint base Lewis-McChord, Wash. Staff delegates also visited a C-17 static aircraft, where they briefed on the 62nd Airlift Wing’s Prime Nuclear Airlift mission. (U.S. Air Force photo/Airman 1st Class Jacob Jimenez)