U.S. Air Force Airmen from the 355th Fighter Wing and University of Arizona Air Force ROTC cadets lay against a fence during an emergency medical exercise during Angel Thunder at Davis-Monthan Air Force Base, Ariz., April 13, 2013. The volunteers played victims of a simulated aircraft crash. As walking-wounded victims, they were moved out of the way to a less hectic area so that medical personnel could attend to more severe injuries on the spot. (U.S. Air Force photo by Senior Airman Timothy Moore/Released)