It was fought using many of the same principles that "won" Korea, and by many of the same generals too, namely DePuy. But, those tactics, which worked ok in Europe and against Imperial Japan, don't work for shit against an insurgency. There was corpo-style rot in the officer corps too, but the main failing was the approach in general. At one point one of the generals was asked by a congressman "how do you fight an insurgency" and his hare-brained response was "with force". See also: Bosnia, Iraq, Afghanistan.