Marine Corps Joseph G. Mullican, left, a radio chief and Lance Cpl. Matthew J. Rooney, a radio operator both with Headquarters Company, 7th Marine Regiment,1st Marine Division (MARDIV), set grids on a RF-3080 satellite antenna at Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., Dec. 10, 2017. The Regiment played various roles in exercise Steel Knight 2018. ( Marines Corps

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