If you ever see them moving weapons out to the silos, you'd see that, too.
Nobody wants to be the one who let one fall into the wrong hands.
The bottom line, though (for the tourists' benefit) is that it takes more than just lax security (at a few levels) to even get the weapon on the apron, much less send it out of town--and this was more than one weapon.
Partial List:
Command Authority
Base Commander
MOSR-Schedule Statused daily and far in advance
Base Safety
Base Security
Wing Commander
Munitions Control
...and that’s just for the weapons.
The Aircraft manifesting is an entire new layer!