U.S. Air Force and Army ROTC cadets from the University of Arizona ride in an Army CH-47 Chinook helicopter on their way to the White Mountains, Ariz., April 13, 2013, to participate in exercise Angel Thunder 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. (U.S. Air Force photo by Senior Airman Brittany Dowdle/Released)