Goofs

The admiral that picked up the Mark 5 computer hardware was out of uniform in several aspects. The long sleeve khaki shirt is a working uniform item and not authorized for wear in public. His garrison cap was worn incorrectly. Lastly and most importantly, he would not have had the full beard the actor had. Beards have not been authorized (without a medical doctor's authorization) for decades in the Navy. Even if he had such permission the grooming of that beard would not come close to the standards set for those with permission. As a side note, Navy admirals are expected to maintain standards above and beyond the average sailor. No admiral would wear a beard period, even if authorized.

After fighting the Asians for the first time, Walker briefs his subordinate Rangers that the criminals are Korean. There's no way he could know that for sure, and it's also questionable whether his subordinates will be able to tell the difference between a (North or South) Korean and an Asian of another nationality, or even ethnicity.