U.S. Marines with Alpha Company, 1st Battalion, 6th

U.S. Marines with Alpha Company, 1st Battalion, 6th Marine Division, 2nd Marine Division (MARDIV), hike to their next basic mountain training class location, landing zone sardine rock, where they will learn how to rappel during Mountain Exercise 5-15 at the Marine Corps Mountain Warfare Training Center, Bridgeport, Calif., Sept. 16, 2015. Marines participate in a month-long field exercise focusing on core mission essential tasks such as assault climbing, animal packing and small unit movements, to strengthen expeditionary high altitude warfare tactics in a mountainous environment against a hybrid threat, as they prepare for world-wide deployment. (U.S. Marine Corps photo by Cpl. Kelly L. Street, 2D MARDIV COMCAM/Released)