Lance Cpl. Ryan S. Heffentrager, a field artillery cannoneer with Battery F, 2nd Battalion, 11th Marine Regiment, 1st Marine Division, prepares his equipment during live-fire operations as a part of Desert Fire Exercise in preparation for Steel Knight at Marine Corps Air Ground Combat Center Twentynine Palms, Calif., on Dec. 4, 2015. The tough, realistic training is intended to develop combat skills necessary to operate as the ground combat element of the I Marine Expeditionary Force.

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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Keywords: 11th, desfirex, knight, marines, steel