Marines with 3rd Battalion, 5th Marine Regiment, 1st Marine Division, hold perimeter security during a raid as part of Steel Knight 17 at Yuma, Ariz., Dec. 7, 2016. Steel Knight is an annual exercise led by the 1st Marine Division that spans the Western United States and California coast.

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Photo credit: © Conner Flecks / Alamy / Afripics
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