KLIZ was a SAC base which had B-52's cocked on nuclear alert and ready to launch with a few minutes warning.
Even with all it's security, they couldn't keep a wayward bull moose from wandering onto the runway.
It happened on more than one occasion.
A friend of mine had to intercept a group of armed men who broke through the perimeter fence of a U.S. nuclear weapons facility. They had authorization to "shoot and kill" intruders.
Turned out to be a couple of drunk guys with rifles who thought that a nuclear weapons facility grounds might be a good place to hunt deer.
Back on topic, in the 1980s an
Ozark DC-9 crashed into a snow plow while landing at Sioux Falls, separating the right wing and igniting a fireball. The snow plow operator was killed but miraculously all crew and passengers escaped with minor injuries. The probable cause was inadequate ATC service.