U.S. Air Force Staff Sgt. Lavon Johnson, a medical technician assigned to the 60th Medical Group, Travis AFB, Calif., assembles a Mobile Aeromedical Staging Facility supporting a field exercise at Joint Readiness Training Center (JRTC), Alexandria, La., Oct. 8, 2012. JRTC 13-01 is designed to prepare and educate U.S. military service members in a simulated combat environment.