Marines from 1st Battalion, 1st Marine Regiment, 1st Marine Division hike through a simulated chemical attack at Marine Corps Base, Camp Pendleton, California, Jan. 12, 2019. Marines train in extreme environments in order to achieve maximum lethality during the intensity of war.

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Photo credit: © Nelly George / Alamy / Afripics
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Keywords: 1/1, 1st, archive, armed, cbrn, corps, daniel, defence, division, forces, hike, marine, military, reportage, rhita, servicemen, usa