Maj. Chris Ashenhurst, an operations officer with 1st Tank Battalion, 1st Marine Division, explains the scheme and maneuver of tanks with the terrain model during Steel Knight 17 at Marine Corps Air Ground Combat Center Twentynine Palms, Calif., Dec. 6, 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: © AB Forces News Collection / Alamy / Afripics
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Keywords: 1st, battalion, corps, knight, marine, marines, regiment, steel, tank, usmc