Marines with 3rd Battalion, 5th Marine Regiment, 1st Marine Division, hold security during a military operation in urban terrain training as part of Steel Knight 2017 in Yuma, Ariz., Dec. 7, 2016. Marines were inserted by air on V-22 Ospreys and cleared the town where there were simulated enemies. The training was part of the battalion training for their upcoming deployment with the 31st Marine Expeditionary Unit.

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Photo credit: © Conner Flecks / Alamy / Afripics
License: Licensed
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