MARINE CORPS RECRUIT DEPOT SAN DIEGO (March 3, 2006) -- The sounds of their cadence roll through the halls and across the grounds of the depot. Up to 65 Marines go to Drill Instructor School each cycle. During this training period, students learn methods of training recruits to become United States Marines. The overall goal of this institution is to give these students as much knowledge from their instructors’ own experiences, as best they can, said Gunnery Sgt. Christopher L. Hambaugh, Drill Instructor School instructor. Every instructor served time in the trenches before he became an instructor at the school....