Marines with Marine Air Control Group 28 conduct a gas mask safety class during 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 photo by Staff Sgt. Kowshon Ye)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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Keywords: 2nd, aircraft, chamber, cold, confidence, exercise, gas, marine, shield, training, ullr, weather, wing