And we have lost in virtually all of those places. Funny that the hero of the Pacific MacArthur was adamant about not getting involved in a ground war in Asia.
Wrong goals. The US has been perfectly capable of crushing any organised state it has invaded. The US problem has been, sometimes, trying to create or reform societies. Its succeeded in that too, often.
I suggest looking at the big picture and not doing a Howard Zinn. That is, they not only miss the forest for the trees, but assume that the forest is their map of bear droppings.