U.S. Air Force independent duty medical technicians with the 563rd Operations Support Squadron apply simulated wounds on volunteers playing the role of plane crash victims during an exercise for Angel Thunder 2013 at Davis-Monthan Air Force Base, Ariz., April 13, 2013. Angel Thunder is a joint service, interagency and multinational combat search and rescue exercise designed to provide training for personnel recovery assets in a variety of scenarios to simulate deployment conditions and contingencies.