Ft Meade, and places like it that handle the same information, is a 7 ring installation. The fence around it is the first level. Then you have the guards (NSA Police). Third level is card entry points at the doors. Fourth level is hand readers/weight measuring points called “Dead Man Control Points.”
Dead Man Control Points hand reader is teamed with a actual scale built into the floor. Your weight is in a database along with your hand print. Both must match to get past that point.
Levels five, six and seven are complex and involve different methods of verifying data you enter against certain databases.
The attack at the guard house (control point) shows exactly what was to happen in such an event. Security at Ft Meade is much better than at the White House.