There is a big intangible with NK, and that's the fanaticism factor. Kim is god, general, father, everything to them, and they are told that America is the root of all their problems and ate their babies or whatever in the last war. Do they believe this, or do they only publicly display allegieance to stay out of a gulag? Do you want to test them? What's to gain if these poor bastards want to throw their life away for Dear Leader and 'revolutionary ideals' or whatever. It's sad really. US soldiers don't carry that kind of fanaticism, and wouldn't be fighting to defend their home and way of life from foreign invaders either. I guess you won't see many Americans jumping into the fray yelling "For Obama!", it's ridiculous to even think of it. When you have an inferior opponent with that fanaticism, you're going to get the terror tactics of banzai/kamikaze type warfare, conventional warfare is suicide anyway.