Air Force Plant 42
This is a classified aircraft manufacturing plant used by the Air Force as well as NASA. Security here is incredibly tight, so the nothing is leaked, and speaking about the upcoming work is treason and a dark, solitary box.
It was here that the US developed the U-2 Spy plane, the SR-71 Blackbird, the B-2 Stealth Bomber and the F-22 Raptor. Knowing how fearsome those aircraft are, I can’t imagine what the Air Force and NASA are cooking up now.