Sgt. Gustavo Sierra, a motorman with 1st Light Armored Reconnaissance, 1st Marine Division, demonstrates to LCpl. Joshua Sanders, a scout rifleman with 1st Light Armored Reconnaissance, 1st Marine Division, how to properly call for fire over the radio 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 1st Marine Division that spans the western United States and the California coast.

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Size: 1732px × 1155px
Photo credit: © Conner Flecks / Alamy / Afripics
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