Ahem.
Yes it's open to Pt. 91 - what's your specific security based need for going there?
Get the picture?
The exception is for "special" people and planes. Don't think about it for a while. Signature is shut down and that end of the ramp looks more like a military base than an FBO.
You've got HEF, IAD, JYO, GAI, BWI, and FME. You're not going inside the 15NM circle unless you're 121 or military/special.
The FAA, Homeland Security, Secret Service, etc. etc agencies have made this airspace a top priority! To translate that into english - when pigs fly, they may consider opening the airspace again - but probably only to barnyard animals.