A Marine with Company L, 3rd Battalion, 4th Marine Regiment, conducts a night rappel during Mountain Warfare Training at Marine Corps Mountain Warfare Training Center, Bridgeport, Calif., Oct. 17, 2016. The Marines are not allowed to use a light source and cannot speak to the Marine who belays below.

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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Keywords: 3/4, 3rd, 4th, battalion, bridgeport, center, corps, crossing, marine, marines, mountain, night, regiment, repel, repelling, swimming, training, usmc, warfare, water