U.S. Air Force Senior Airman Ryan Silva, 435th Security Forces Squadron contingency response team member, provides security for his comrades while they carry a simulated casualty during exercise Frozen Defender in Grostenquin, France, Jan. 14, 2020. Frozen Defender tests the squadron’s capabilities in a contested environment under harsh conditions. Evaluators designed the exercise schedule to test the Defenders’ flexibility. (U.S. Air Force photo by Staff Sgt. Devin Boyer)