A U.S. Air Force HH-60 pavehawk helicopter provides transport during a mass casualty exercise for Exercise Angel Thunder at Camp Navajo, Flagstaff, Ariz., May 9, 2014. Angel Thunder 2014 is the largest and most realistic joint service, multinational, interagency combat search and rescue exercise designed to provide training for personnel recovery assets using a variety of scenarios to simulate deployment conditions and contingencies. Personnel recovery forces will train through the full spectrum of personnel recovery capabilities with ground recovery personnel, air assets and interagency teams. (U.S. Air Force Photo by Airman 1st Class Chris Massey/Released)