Stuart, it's not so much a factor of the guards on the gates becoming familiar with you as it is the sheer size of the installation.

Imagine the City of Littleton as a military base where it was necessary to allow thousands of people and associated vehicles in and out, sometimes numerous times for any given vehicle, through a number of entry positions, and you start to see the problem.

Security is by nature going to be limited. It would be nearly impossible to do a lot more than to just look at the base sticker on the windshield and wave the vehicle through. Even during heightened security they'll do random checks or search random or a few targeted vehicles. They just can't do any more than that and still keep the base functioning. You could literally drive an army on to the base without anyone being stopped, questioned or searched. Actually, come to think of it, that DOES happen every day.

Getting firearms on to that base, or nearly any other, is not going to be a problem. At all. Committing crimes with said smuggled firearms is not going to be a problem at all. You'll eventually face armed resistance...but it's gonna be too late for a lot of innocent people.

We know that for a fact and nothing has changed since we learned that. The bad guys are still free to operate, the good guys are a little less safe despite so-called "increased security measures".