This loss had almost nothing to do with the military. When most people think we started to lose the war, the Tet offensive, was actually the knock out victory we needed to win Vietnman, but the reporters told only of the attrocities of the S. Vietnamese and pictures of Viet Cong running around the US Embassy, never did they tell that most of the territory conquered was regained within hours, it was a huge military victory for the US. The Vietcong were forced into hiding, 80% of their members were killed, captured, or wounded, but the public was lead to believe by the media that it was a loss for us, we could have ended the war in less than a year, instead it was forced to drag on for years, costing even more American lives. It was thanks to the hippies and draft dodgers that we lost the war. This war was not lost in Vietnam, it was lost at home, you would think that the National Guard killing 11 students at Kent State they would have taken the hint and shut up, letting the military do what they do best.

And a better name for this thread is "Why didn't the US win in Vietnam?" Because to ask "Why couldn't the US win in Vietnam?" is to say that a US victory was impossible.

i think that is a good point.

IMO the war was lost in the USA as Damien said, but also i think the US tactics were a little off. From what i know the US soldiers were dropped off at areas, and the were to walk and patrol areas that Viet Kong is hiddin in. I think it wasn't an organized tactics that cost US too many lives. Platoons were send out in different areas to sweep across a certain area for Viet Kong, plus the terrain played a factor in this too.

IMO the war was lost in the USA as Damien said, but also i think the US tactics were a little off. From what i know the US soldiers were dropped off at areas, and the were to walk and patrol areas that Viet Kong is hiddin in. I think it wasn't an organized tactics that cost US too many lives. Platoons were send out in different areas to sweep across a certain area for Viet Kong, plus the terrain played a factor in this too.

Krill, were you there? I was and the tactics were fine for the most part. There was nothing more demoralizing to the enemy that to wake up one morning and find an American firebase smack in the middle of his back yard.
Just for clarification, the Viet Cong were not a problem my friend. The Viet Cong were not even there. I saw NVA and Chinese but no VC, none.
The thing that kept this otherwise beaten enemy going was the opposition to war in the U.S., nothing else. That's what kept the peace talks stalled and that's what kept people dying. In all the years of America's involvement, the communist supplied and trained invaders from the north never won a single major battle against the American forces even though we were quite limited in our levels of response and the number of troops we were sent.
You talk about patrolling in enemy territory? Where else would you patrol? That made no sense to me.