A Marine with 1st Battalion, 1st Marine Regiment, 1st Marine Division, holds security during Mountain Training Exercise 5-23 at Marine Corps Mountain Warfare Training Center Bridgeport, California, Sept. 1, 2023. MTX gives Marines the opportunity to hone their combat and survival skills in an austere mountain environment.

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Keywords: 1st, bridgeport, division, fex, marine, marines, mountain, mtx, training, warfare