Oct 5, 2015

Sergeant Randall Bowker (center), an instructor assigned to the Marine Corps Mountain Warfare Training Center Bridgeport, Calif., explains an expedient method of purifying water to Marines with Headquarters Battalion, 1st Marine Division during phase one of Mountain Warfare Training Exercise 5-15 aboard MCMWTC Bridgeport, Calif., Sept. 5, 2015. Phase one of MTNEX required the Marines and Sailors to participate in hands-on instruction which gave them the necessary skills used to conduct the rest of the exercise and to survive the austere, mountainous environment. (U.S. Marine Corps photo by Cpl. Will Perkins/Released)

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1st Marine Division