” But where should labeled classified documents be exposed.”
Years ago ( during the Vietnam War era) I worked in Military R&D. Work required a clearance and documents were controlled. That said, a lot of the “classifications” were made to obscure what was being done rather than for the purpose of protecting the country’s secrets. It is too easy to “classify” something to protect nefarious activity. I learned recently that something that I did that was “classifled SECRET was shown to the Congress (and the public) many years ago.