Marines with Marine Air Control Group 28 conduct a convoy training exercise during Ullr Shield on Fort McCoy, Wis., Jan. 22, 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 Lance Cpl. Jailine L. Martinez)

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Keywords: 28, cold, convoy, fob, fort, freedom, macg, mccoy, shield, training, ullr, weather, wisconsin