This movie is amazing. Show it to your liberal friends who think the Vietnam War ended because students marched with signs.
Whole units of the US army refusing to go into combat. The crew of an NSA spy plane (this was before spy satellites) who refused to report any information to their superiors after flights over Vietnam! Inspiring!
During the Vietnam war, resistance to the war machine often came from within the military itself, as soldiers organized to resist the war effort in massive numbers.
The documentary, "Sir, No Sir!" looks a this wave of massive anti-war activity.
https://www.youtube.com/watch?v=d7r69uaJrvo