What markings must be applied to a letter of transmittal containing confidential information?

A letter of transmittal containing confidential information must possess various markings to ensure it is handled appropriately and in compliance with security protocols. This includes banner markings, which denote the classification level of the information within the document, helping recipients quickly understand the sensitivity of its contents. The classification authority block (CAB) is also essential, as it identifies the official responsible for classifying the information and indicates the rationale behind the classification level assigned.

Additionally, while a security tracking number can be relevant for tracking and managing classified documents, it may not be as universally applicable compared to the necessity of both banner markings and the CAB. Therefore, it is important that all relevant markings are applied to such a document, signifying the importance of safeguarding confidential information comprehensively. Thus, the answer encompasses the requirement for both banner markings and the CAB to be applied to ensure the transmission of classified information is secure and conforms to established guidelines.