U.S. Marines and Army soldiers receive classes for cold weather survival on the U.S. Marine Corps Mountain Warfare Training Center (MWTC) Bridgeport, Calif., Jan. 17, 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)