Gunnery Sgt. Gage CoDuto looks at an old shell on Range 7 aboard Marine Corps Base Quantico on Oct. 30, 2013. The Marines, all Explosive Ordnance Disposal technicians, conducted a range sweep to clear the range of unexploded ordnance. - Gunnery Sgt. Gage CoDuto looks at an old shell on Range 7 aboard Marine Corps Base Quantico on Oct. 30, 2013. The Marines, all Explosive Ordnance Disposal technicians, conducted a range sweep to clear the range of unexploded ordnance.