U.S. Marine Corps Sgt. Jordan K. Heiselman, far left,

U.S. Marine Corps Sgt. Jordan K. Heiselman, far left, platoon sergeant, Weapons Platoon, Alpha Company, 1st Battalion, 6th Marine Regiment, 2nd Marine Division (MARDIV), former Marine Corps Mountain Warfare Training Center instructor, mans a rappel rope aiding Marines from his company in descending down a cliff face properly and safely, during basic mountain training, MCMWTC, 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)