Also, if you create the classified material you are responsible for putting the headers on.
And if you find something that is classified and it is incorrectly marked you are responsible for reporting that to security.
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I don't intend this to be a "gotcha" but I spent 24 years as a technical editor and proposal coordinator in the defense industry and, although your statement above is accurate, in practice there are exceptions. I well recall engineers handing me Top Secret material (text and rough-draft illustrations) that had no classified markings but which I knew to be Top Secret. Part of my job was to mark it appropriately.