U.S. Air Force Airmen on the United States Air Forces

U.S. Air Force Airmen on the United States Air Forces in Europe and Air Forces Africa team, prepare to start the dismounted operation competion as Tech. Sgt. Glendon Blue, team time keeper, watches the stopwatch during Air Force Defender Challenge Sept. 11, 2018 at Joint Base San Antonio-Camp Bullis, Texas. During the challenge Airmen are placed into a four-person team and move as quickly as possible across a 3-6 mile distance while using teamwork to overcome physical and mental barriers. (U.S. Air Force photo by Sarayuth Pinthong)