My unit was at a briefing on Christmas Eve by a 3 star general. He told us to expect 75% casualties within the first 24 hours.
Those camps have been statically in place for decades - so I always assumed that the Norks had a grid coordinate for every barracks, every parked tank, etc...and a rocket pointed at each one.
I also believed that the Norks had to know the best time to attack was Saturday night, since so many guys went to town to get drunk.