Marine Cpl. Rusty Mongold, a machinist with Engineer Maintenance Company, 1st Maintenance Battalion, 1st Marine Logistics Group, cuts a piece of metal using the Computer Numerical Control during exercise Steel Knight at Marine Corps Air Ground Combat Center Twentynine Palms, Calif., Dec. 8, 2016. Steel Knight 2017 is a 1st Marine Division-led exercise that exposes Marines and Sailors to skill sets necessary to operate as a fully capable Marine air ground task force. Mongold is from Port Arthur, Texas.

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