A Royal Marine Commando communicates with his security team during an isolated personnel scenario at Angel Thunder 17 in Florence, Ariz., 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 Tech. Sgt. Larry E. Reid Jr.)