However, the SOP for a war with NK is to lay down a nuclear "wall" at the 38th parallel...or shortly below it. There has been no plan for a ground war in Korea for AT LEAST 30 years. The US has only one response to a NK invasion of the south, nukes and more nukes.
That's why, when the Pueblo was hijacked by NK, ('68 almost 40 years ago) there were no conventionally armed US fighters close enough to do anything before the ship was taken into port. IIRC, some were launched, but then recalled.