The rear cargo doors of an Antonov An-124-100 Ruslan that transported two French Air Force Caracal EC-735 helicopters to participate in Exercise Angel Thunder with French air force personnel, open after arriving at Davis-Monthan Air Force Base, Ariz., May 2, 2014. Angel Thunder 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. (U.S. Air Force Photo by Airman 1st Class Chris Massey/Released)