I remember a college conversation some time ago with a Mexican American, who was trying to be more Catholic than the Pope, and claimed to me that America never lost in Vietnam because America didnt lose any territory! He probably didnt know about South Vietnam.
Whats more fascinating is that the Vietnam war was based on the Domino theory, that if Vietnam fell to Communist, rest of the region would do the same. The theory was disproven but then decades later, it was back in play and cited as a rationale for Dubya's attack on Iraq, that if Iraq became a democracy, it would lead to entire region becoming democratic! Again proven wrong.