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U.S. Air Force Tech. Sgt. Daniel Waller, 435th Security Forces Squadron ground combat readiness training center course chief, carries a rucksack containing the necessary equipment for exercise Frozen Defender in Grostenquin, France, Jan. 14, 2020. Frozen Defender tests the squadron’s capabilities in a contested environment under harsh conditions. The exercise challenged the Defenders’ ability to deter potential threats and ensure the safety of their fellow Airmen. (U.S. Air Force photo by Staff Sgt. Devin Boyer)
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