“This is contentious claim, since the last combat troops left Vietnam in 1971, while Nathan served in the U.S. military from 1972 to 1976.”
Odd that the combat troops were gone after 1971, but my Dad (USAF) was killed in Vietnam in 1972...
There were no USMC combat formations in VN after 1971, as I understand it. Army was different. Was your dad flying?