[El Gato]

We don't have the ability produce weapons or train draftees (if it comes to that) in sufficient numbers fast enough to fight a conventional war on the peninsula.

We still have lots of Guard heavy forces that could be thrown into the fight. Some might take over in the sandbox, but I doubt there'd be time to make the swap. In fact I doubt there'd be time to move any significant ground forces to Korea. Navy and Air Force aren't very much occupied at the moment though, and they'd be enough to turn everything important in NK into a smoking ruin. The question would be whether they could do it fast enough to prevent the destruction of Seoul.

[blam]

"The question would be whether they could do it fast enough to prevent the destruction of Seoul."

I can't think of any way to save Seoul.

Cluster bombs and aerial mining may thwart a massive influx of troops from the north though.