I was drafted in the peak month, of the entire Vietnam era. A lot of my cohort lost their lives. I have several friends that served in combat, there. And several that died. (My bunkmate from Infantry AIT, died--John Roles, Costa Mesa, California).
For the most part, those who did serve there, maintain it was a half-measured politically managed effort. IOW we could have won if we went all out.
Contrary to some, returning veterans WERE spit on, in airports as they came home.
And after several years, Nixon was reelected in 1972 by a landslide, proving it was NOT the unpopular war, the leftists would preach in the media clear up until now.