Doesn’t have to be a state secret. Just any Information to which access is restricted or it’d be dangerous or undesired if it were just handed out to the public.
Edit: Don’t reveal any secrets here. This is a public forum. Proceed with caution when answering this question.
I’m not sure what I have to contribute here myself, other than the usual incompetency behind the scenes. I mean the existence of that is common knowledge, just not the specifics.