[daniel_reetz]

This matches my experience. In addition I was advised/strongly encouraged to "go dark" on social media and refrain from ever discussing work at lunch, even with teammates.

My badge only worked where I had explicitly been given access, and desks were to be kept clear and all prototypes or hardware had to be locked in drawers and/or covered with black cloths. Almost every door was a blind door with a second door inside, so that if the outer one opened, it was not possible to see into the inner space.