I haven't head anyone point out the Carl Hitchcock, the prime suspect in I, Sniper, and Carlos N. Hathcock II, the who's record matches Hitchcock's in the book.
Hathcock is included in the list of snipers linked to above.
As Hitchcock did in the book, Hathcock pulled seven other Marines from his burning vehicle and was severely burned, which ended his sniper career.
I have read much about Hathcock and have found nothing indicating he received royalties from any product or that he sold autographs; that would seem out of character for him. He refused the Silver Star for his actions in pulling his crew mates from the burning vehicle, stating anyone of us would have done it.
He did have a sniper rifle named in his honor, M25, I think, called White Feather, which was his trademark.
He was diagnosed with Multiple Sclerosis and died in 1999.
Sorry if this is common knowledge here, but wanted to present the legend behind the character in several of Hunter's books.