Marine Corps Lance Cpl. Matthew S. Mueller, a chemical, biological, radiological, and nuclear defense specialist with Marine Aircraft Group 29, searches a training area for simulated chemical threats while wearing class b hazardous material suit during Ullr Shield on Fort McCoy, Wis., Jan. 21, 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, cbrn, cold, fort, marines, maw, mccoy, training, ullr, weather, wisconsin