I read a wargamers book where the author said he was drafting a wargame for the Pentagon and he tried to make it as lifelike as possible. He got his knuckles rapped for showing most tank combat in Western Europe would occur at ranges of 1000 yds or less. The Army built the Abrams to shoot 5000 yds moving 40 mph and still hit. But he showed with German maps of Germany that most places gave a clear line of sight for direct fire of not more than 500 yds. They still made him take all the trees and flatten out Germany so American units could make full use of their 5000 yd tank gun.
However if Korea has rolling terrain and won't allow for mass armor the advantage is to the Americans because our infantry is more tank ready, our tanks learnt in Fallujah how to support platoons individually, and the US Army is allowed an air arm that is exclusively for killing tanks in bad terrain (attack copters) and they're damn hard to spot from a jet flying past.
Within a week we'd have air supremacy in Korea (can't really hide your airfields) air and sea traffic to Norko would be at a standstill and their army has at best 2:1 supremacy in numbers and that aint enough to shove through an army, they'd be halted south fo the DMZ. But in that week North Korea would kill a million Koreans and bomb the South Korean economy back to 1954. So we try not to start it.
The core joke of Hitchhiker's Guide to the Galaxy is that of course no civilization would develop personal computers with instant remote database recovery, and then waste this technology to find good drinks.
Steve Jobs has ruined this joke.