Gunnery Sergeant Carlos Norman Hathcock II ( May 20 , 1942 â `` February 23 , 1999 ) was a U.S. Marine Corps scout\/sniper . Carlos Hathcock ( May 20 , 1942 -- February 23 , 1999 ) was a United States Marine Corps Gunnery Sergeant sniper with a service record of 93 confirmed kills .