Marines and sailors with Ragnarok Company, 2nd Supply Battalion, 2nd Marine Logistics Group listen to a class about establishing bivouacs in cold-weather environments aboard the Mountain Warfare Training Center in Bridgeport, Calif., Jan. 20, 2014. Ragnarok Co. was encamped at a training area at approximately 10,000 feet above sea level for a week while training in preparation for Cold Response 2014, a NATO exercise in Norway.