MOUNTAIN WARFARE TRAINING CENTER, Calif. (Feb. 2, 2021) Marines exit the water of a frozen pond at the Marine Corps Mountain Warfare Training Center, Calif., on Feb. 2, 2021. Marines and Sailors attending the Basic Cold Weather Leaders Course are required to undergo the hypothermia laboratory, a training event where Marines experience and learn to fight against hypothermia. (U.S. Marine Corps photo by Lance Cpl. Andrew R. Bray)