When declassifying a document, a "(U)" should not replace the original portion markings. database. Is this information authorized for use as a source of derivative classification? Classification markings only communicate that information is classified and its required protection level.

How do you mark a classified document?

The title or subject of a classified document is marked with the appropriate classification abbreviation in parentheses -- (TS), (S), (C), or (U) immediately following and to the right of the title or subject.

What is a portion marking?

Portion markings identify the information that must be protected and the level of protection that is required. Documents that are not portion marked shall not be used as source documents for derivatively classified documents.