Well I don't know exactly with this situation. That post was reactionary. As if units patrol with it. That's stupid as if I was an officer coming up with a bone head idea. But only because banning guns was that same kind of reaction by the dark side. But I think concealed/ open or in your trunks should be acceptable. X-ray cars too but theres no way the army would do that. If they got extra money for that, what would happen in the army is every CO would have a new door plaque.
With opportunity and desire being the basic elements of a crime. I think it would definitely make people rethink their strategy for doing this kind of thing. So it would take some of their desire and shorten their length of opportunity. Trying to tighten security would try to catch their opportunity while doing nothing to their desire. Sure if one got caught trying, it might take the next person's desire away. But these are so few and far in between.