who was sergeant lou diamond?
About MGSgt Lou Diamond (USMC) [Mr. Leatherneck] Master Gunnery Sergeant Leland Lou Sanford Diamond, USMC (May 30, 1890 â September 20, 1951) is famous within the U.S. Marine Corps as the classic example of the Old Breed â tough, hard-fighting career marines who served in the corps in the years between World War I and World War II. Early years.