I'm not hearing it anywhere, but I guess I'm just assuming that sneaking illegal firearms into a military base shouldn't be easy. Apparently it is which is sad, especially considering what's happened in that base's recent history.
Fort Hood is the Army's largest installation we have upwards of 90,000 Soldiers and civilians working on the post. It's not reasonable to stop and physically search each vehicle as it enters post. It would literally take hours for everyone to get on base.
They do random checks from time to time but overall it's fairly easy to sneak a small handgun onto the installation.
Even when I was at smaller bases they didn't pull over every vehicle to physically inspect them. The only 100% check that the installations do use is the picture ID check. If you have a military ID you'll likely get waved right through, there's a small chance you'll get insepcted, but other than that you're good to go. If all you have is a civilian ID then you're more likely to be searched.
But again most of the people that visit Ft. Hood have some type of military or Department of Defense ID so the inspections are pretty sporadic for the sake of keeping traffic moving.