U.S. Air Force Defenders assigned to the 435th Security Forces Squadron perform sweeps on an airfield during exercise Frozen Defender in Grostenquin, France, Jan. 14, 2020. Frozen Defender tests the squadron’s capabilities in a contested environment under harsh conditions. The fireteam conducted the sweeps after receiving simulated intelligence, surveillance, and reconnaissance on threats in the area. (U.S. Air Force photo by Staff Sgt. Devin Boyer)