I had the pleasure of meeting Gunnery Sergeant Hathcock (and Gunner Henderson, the author of the books) at my Marine Corps League. He took us up on our offer to take him shark fishing (he loved shark fishing). At the time I was in the Reserves in a Scout/Sniper ("STA" back then) platoon. We had a quiet night with him at the League's bar/lounge (he drank ginger ale). He talked to us about the Marine Corps past and present, asked lots of questions about the current sniper program as it pertained to us, and signed our 93 Confirmed Kills books.
Humbling experience.