Bioenvironmental
U.S. Air Force Capt. Terry Klein, 633rd Medical Group bioenvironmental engineer, sits down for a routine medical check after removing his contaminated gear during a training exercise at Langley Air Force Base, Va., May 16, 2013. To ensure the participants did pass out from heat exhaustion in training or on the field, they receive vests with ice packs to keep them cool. (U.S. Air Force photo by Airman 1st Class Austin Harvill/Released)