Umm, Stevedave, South Korea is the tenth largest economy in the world. The US has had a permanent military presence in South Korea for over 60 years and it's still there. We hold joint Military Exercises in South Korea every year at a cost that would cover the GDP of some small countries. And there is no question whatever that if the North Koreans go crazy and jump over the DMZ that the US is going to jump knee deep in that ass.