U.S. Marines with Combat Logistics Battalion 26, 2nd Marine Logistics Group, sleep in their combat tents after a rigorous hike at the U.S. Marine Corps Mountain Warfare Training Center (MWTC) Bridgeport, Calif., Jan. 19, 2015. MWTC trains Marines across the warfighting functions for operations in mountainous, high altitude, and cold weather environments in order to enhance a unit's ability to shoot, move, communicate, sustain, and survive in mountainous regions of the world. (U.S. Marine Corps photo by Sgt. Anthony L. Ortiz / Released)