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A pararescueman from the 58th Rescue Squadron out of Nellis Air Force Base, Nev., performs tree let-down procedures May 5, 2014, at Camp Navajo, Ariz., in part of exercise Angel Thunder. In 2006, Davis-Monthan Air Force Base, Ariz., conducted the first Angel Thunder as a base-specific exercise. It has since grown to be the largest and most realistic joint service, multinational, interagency combat search and rescue exercise in the world. (U.S. Air Force photo/Staff. Sgt. Jamal D. Sutter)