U.S. Air Force and international partners stack on the side of the building at Florence, Ariz., during Angel Thunder 17, May 9, 2017. Angel Thunder is a two-week, Air Combat Command-sponsored, joint certified and accredited personnel recovery exercise focused on search and rescue. The exercise is 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 Staff Sgt. Corey Hook)