The Pentagon needs to figure out how will we will neutralize the 10,000 artillery pieces aimed at Seoul.Most of the artillery pieces are already in place, camouflaged and dug in. But we can cut the lines of communication between Kim Il Jung and his commanders.If they do not receive his orders ,they will be unable to carry out an attack. I am sure that we have studied all of the possible scenarios over the decades.They have also had since 1953 to figure out all the scenarios we might take. But maybe the North Koreans have figured out that this would be the plan of attack by the United States and set up some sort of "back channel" with his field commanders. Possibly some sort of "dead hand" system exists between the North Korean leadership and the commanders out in the field. If the leadership is destroyed, but the field commanders will carry out their last instructions. The Russians had a "dead hand" system that in case the Russian leadership is destroyed their nuclear missiles will automatically trigger a launch. Whether or not it exists its unclear. Putin might have reactivated the system.We used to have something similar called The Emergency Rocket Communications System (ERCS). That was dismantled in 1991.