mp40 and thmpson are old... i would go for a M21 EBR (Enchanced Battle Rifle) or a SR-21 with a silencer and a ghilie suit and having a USP45 with silencer and laser as secondary just in case and set North Korea free....
Now seriously... i think North Corea is trying to make South Korea mad....this is stupid i dont want to see another Korea war geez...btw checkout a game called Homefront is about North Korea conquesting South Korea and then invade USA and conques it ^^