U.S. Air Force airmen perform an engine running offload from the back of a C-17 Globemaster III at Geronimo landing zone during a field exercise at Joint Readiness Training Center, Fort Polk, La., Jan. 16, 2014. Service members at JRTC 14-03 are educated in combat patient care and aeromedical evacuation in a simulated combat environment. (U.S. Air Force photo by Master Sgt. John R. Nimmo, Sr./Released)