Mawhinney, the son of a World War II Marine Corps veteran, was an avid hunter in his youth. Mawhinney joined the U.S. Marine Corps in 1967, spending sixteen months in Vietnam starting in 1968. Although less well known than his more famous counterpart sniper legend Carlos Hathcock, Mawhinney actually had 103 confirmed kills to Hathcock's 93. Mawhinney had another 216 that are listed as "probables" by the U.S. Marine Corps.

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