When my son was in the Air Force, my wife and I visited quite often. On our first visit, we were allowed inside this top secret Communications Center, but everything in sight was covered up so we could look around everywhere –– Heck, even the toilet paper in the Men’s room was disguised.

Anyway, at the exit, there’s a sign above the door, which reads: "You have been exposed to Top Secret Material. Please destroy yourself before leaving the building."