I spent years doing research at the National Archives on Vietnam to verify things that had happened. Virtually everything I looked at had been classified, and I had to get it declassified.
Every page has to have the security classification on both the top and bottom in capital letters, plus the front page had to specifically state who was the authorizing authority and the regulations they operated under.
Now I just looked up the Federal Code of Regulations to verify it is still the same. It is in fact a multi-page document.
You can “bullet” individual lines with a lower code classification but the highest level of security has to be at the top and bottom of every page.
In other words sending messages and just putting a C next to a line but not confidential at the top and the bottom of any and all documents is a violation of federal security policy.
DONALD ARMSTRONG
Henniker