What should be the correct banner marking for a U.S. document that contains NATO CONFIDENTIAL information?

The correct banner marking for a U.S. document that contains NATO CONFIDENTIAL information is designated as "CONFIDENTIAL//FGI NATO." This marking adheres to established standard procedures for handling classified information that originates from the NATO alliance, respecting both U.S. and NATO classification protocols.

In this context, "CONFIDENTIAL" indicates the classification level of the information per U.S. standards, while "//FGI NATO" denotes that the information is also protected under NATO standards, which denotes "Foreign Government Information." This dual designation is essential for conveying both the classification status and the nature of the information effectively.

Using correct markings is crucial in ensuring that individuals handling the document understand the sensitivity of the contents and comply with appropriate safeguarding measures. Failure to use the correct banner could lead to mishandling or unauthorized disclosure of sensitive information, which could have significant implications for security and trust among member nations.