Marine Corps Gunnery Sgt. David Goral, the chemical, biological, radiological and nuclear defense Staff Noncommissioned Officer In Charge assigned to Marine Wing Headquarters Squadron 2, has a conversation with an instructor during a polar plunge as part of exercise Ullr Shield on Fort McCoy, Wis., Jan. 17, 2018. Ullr Shield is a training exercise designed to improve 2nd Marine Aircraft Wing’s capabilities in extreme cold weather environments. ( Marine Corps

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