Marines with 1st Battalion, 7th Marine Regiment, provide security from an observation post at Drop Zone Blackbird, during Mountain Training Exercise 6-19, at Marine Corps Mountain Warfare Training Center, Bridgeport, Calif., Oct. 14, 2018. MWTC is the only installation across the Department of Defense that conducts unit-level mountain warfare training in addition to teaching mountaineering and related skills at its professional mountain warfare schools.

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