NSA has many facilities located in MD. As mentioned the main HQ is on Fort Meade. Friendship Annex's 1, 2 and 3 are located near BWI. Friendship
Annex 2 hosts the National Cryptologic School. There are also some facilities located in Laurel, some are R&D as many contractors are located in the
area also. Take a look at James Bamford's "The Shadow Factory", he writes a bit about it.
That's all the old Cold War microwave communications lines, hubs and transmitters. Each microwave tower had a hardened bunker at it's base. I'm not
that far from Moseley. that towers are still visible all over the country.
Yes, I know for a fact there is. The last post is full of you know what. I know a Trooper and someone who works for NSA and there is a secret
underground facility in Finksburg, MD. Obviously they do not want you to believe this. A Trooper was not just parked there. Does this person think you
are stupid? Troopers are paid OT to guard there. This is FACT! I know first hand.