Marines with Marine Air Control Group 28 conduct urban operations training during Ullr Shield on Fort McCoy, Wis., Jan. 20, 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 Sgt. Joselyn Jimenez)

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Keywords: 2d, cold, fort, marines, maw, mccoy, training, ullr, weather, wisconsin