Wd Harold Wilson. Good Huddersfield lad.
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No, they would have lost in the long run anyway. All subsequent analysis has shown this to be correct including McNamara's. The overwhelming consensus post '75, even amongst those involved in the decision making from 63-68, was that there was no military option that would have led to a victory. Many knew that as early as '63.
They had two choices; get out, or commit to staying and trying to control the country as an occupying force. Even ignoring the fact that they absolutely did not want to do the latter, even if they did try the North Vietnamese would simply have turned it into a guerilla war and waited them out. They weren't going anywhere, it was their country after all.
The overwhelming majority of Vietnamese people wanted foreign powers out and the reunification of the country. Given this, the Americans were fighting the people and as a result were always going to ultimately lose. As Johnson said, it was a war for the hearts and minds of the Vietnamese people, and the military was not the tool to win that fight.