Army Staff Sgt. Edwin Williams, South Carolina Army National Guard, 218th Leadership Regiment instructor, provides direction to a crawler tractor operator at McCrady Training Center in Eastover, South Carolina, Feb. 26, 2017. As part of the horizontal construction engineer reclassification course, Soldiers become proficient in maneuvering the tractor for a variety of task, including flat bottom ditching, a defensive formation used to conceal tanks on the battlefield. ( Army National Guard photo by Sgt. Brian Calhoun, 108th Public Affairs Detachment)

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