Members of the 459th Aeromedical Evacuation Squadron secure litters and oxygen lines prior to takeoff of a KC-135R Stratotanker on the Peterson Air Force Base, Colorado, flight line, Sunday, Aug. 28, 2016. More than a dozen 459th AES flight nurses, technicians and administrators flew to Peterson to conduct joint unit training with other AE squadrons on board the KC-135, C-17 Globemaster III and C-130H3 Hercules. (U.S. Air Force photo/Staff Sgt. Kat Justen)