What marking must be on a classified document when it is ready for transmission?

When a classified document is prepared for transmission, it is essential that it includes a classification level marking. This marking indicates the sensitivity of the information contained within the document and provides authorization protocols for safe handling and dissemination. The classification level informs recipients about the necessary precautions they must take to protect the information according to its designated level—be it confidential, secret, or top secret.

The classification level marking serves as a key identifier that helps ensure that individuals who access the document have the appropriate clearance level and need-to-know. Without this marking, the document’s potential risks and the required security measures might not be clearly communicated, leading to mishandling or unauthorized access to sensitive information. Thus, including this marking is not only necessary for compliance but is also critical for maintaining the security of classified information during transmission.