U.S. Air Force Master Sgt. Alejandro Rojas, an aeromedical service journeyman with the 18th Aeromedical Evacuation Squadron, assembles a tent during Joint Readiness Training Center (JRTC) 14-05 training at Fort Polk, La., March 14, 2014. The JRTC provides U.S. military units and personnel with realistic pre-deployment training scenarios in all aspects of armed conflict.