Angel Thunder 2013
U.S. Air Force Pararescuemen, National Park Service Ranger and local fire and rescue crews participated in a mass causality exercise April 13, 2013 at the Grand Canyon, Ariz. during Angel Thunder 2013. Angel Thunder is the largest joint service, multinational, interagency combat search and rescue exercise designed to train personnel recovery assets using a variety of scenarios to simulate deployment conditions and contingencies. (U.S. Air Force photo by Staff Sgt. Tim Chacon)