Bunny, about teh Vietnam thing, we never actually lost a single battle in the war.
I would say that we "lost the peace", that is we managed to piss off more people than we killed enemies. Mostly piss-poor handling from the top levels of government down to top level military command.

Our guys fought like hell and killed more NVA and VC than they killed of our guys; we just ended up making more enemies in the process due to bad judgement from the folks as the top; which is typical of all wars, just not all bad decisions lead to ultimate defeat, or the other guy makes more mistakes (like Hitler)