If NATO information is included in a non-NATO document by a US contractor, what classification markings are used?

When NATO information is included in a non-NATO document by a US contractor, it is crucial to understand that the handling of classified information must align with US regulations regarding classification markings. In this scenario, the content still falls under the purview of US classification standards, meaning that the document must be marked in accordance with US classification guidelines.

Using US classification markings ensures that the information is protected according to the regulations set forth for US government information, even when NATO information is present. This marking indicates who is responsible for the information, outlines the applicable procedures for handling classified material, and provides the necessary protections under US law.

In contrast, NATO classification markings are reserved for documents that are specifically classified under NATO standards. A non-NATO document created by a US contractor does not fall under NATO's purview, which means that its classification would not be governed by NATO guidelines. Joint classification markings would typically indicate collaboration and bilateral agreements, which are not applicable in this case. Lastly, while Confidential is a specific classification level, it is not sufficient to represent the entire scope of US classification markings needed for this document.