MARINE CORPS BASE QUANTICO, Va (Jan. 9) - Cpl. Ryan Halstead, a small arms technician for Ground Ordinance Maintenance Platoon, The Basic School, examines the bore of a disassembled M4 rifle fired by lieutenants in Infantry Officers Course at Range 15 on Jan. 9. Ordinance Maintenance Platoon maintains the third largest armory in the Marine Corps. - MARINE CORPS BASE QUANTICO, Va (Jan. 9) - Cpl. Ryan Halstead, a small arms technician for Ground Ordinance Maintenance Platoon, The Basic School, examines the bore of a disassembled M4 rifle fired by lieutenants in Infantry Officers Course at Range 15 on Jan. 9. Ordinance Maintenance Platoon maintains the third largest armory in the Marine Corps.