U.S. Marines with 3rd Battalion, 7th Marine Regiment (3/7), hike up the side of a hill during a field exercise aboard Marine Corps Air Ground Combat Center Twentynine Palms Calif., June 11, 2013. The Marines conducted cross training with all three types of mortar systems in order to ensure proficiency prior to deployment. (U.S. Marine Corps photo by Lance Cpl. James Mast 1st Marine Division, Combat Camera/ Released)
<br>Unit: 1st Marine Division - Combat Camera
Lance Cpl. James Mast
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