German air force rescue personnel lead simulated patients off of a German army CH-53GS during an Angel Thunder 2015 mass casualty exercise at Winslow-Lindbergh Regional Airport, Ariz., June 5, 2015. U.S. military forces and partner nations worked together during the exercise to transport patients from Camp Navajo Training Site, Ariz., to the casualty collection point located at the Winslow–Lindbergh Regional Airport. (U.S. Air Force photo/Airman 1st Class Chris Drzazgowski)