Gunnery Sgt. Joshua A. Peterson, one of the crack shots on the Marine Corps Shooting Team, practices his aim at the Stone Bay Ranges on Marine Corps Base Camp Lejeune, N.C., April 13, 2012. The custom-made rifle he uses is specially weighted. - Gunnery Sgt. Joshua A. Peterson, one of the crack shots on the Marine Corps Shooting Team, practices his aim at the Stone Bay Ranges on Marine Corps Base Camp Lejeune, N.C., April 13, 2012. The custom-made rifle he uses is specially weighted.