That question may have already been answered by Stuart Slade in his blog/essay "The Nuclear Game"
( https://gist.github.com/benders/141611 )
"..Every so often, the question gets asked "How could the US have won in Vietnam?" with a series of
replies that include invading the North,extending the bombing to China and other dramatic escalations
of the conflict. Now, it should be obvious why such suggestions could not, in the real world, be contemplated.
The risk of ending up in a nuclear war was too great"
I don't think at all, that this theme in itself is demanding to be locked, or not to be discussed here. It's just,
that such discussion quite often are lacking necessary prudence and politeness after only few posts !
So, put us right about those former experiences ! 
