Which publication provides comprehensive guidance on identifying and marking classified documents?

The Marking Classified National Security Information booklet is the key resource that provides detailed instructions on how to identify and properly mark classified documents. This publication outlines the standards for marking classified information in accordance with various regulations and policies, ensuring that individuals handling such documents can easily recognize their classification level. It serves as an essential reference for personnel responsible for the management and safeguarding of classified materials, emphasizing the importance of correct labeling to prevent unauthorized disclosure.

In contrast, the other publications serve different purposes. The Classified Document Management Guide typically focuses on the broader processes and procedures for managing classified information throughout its lifecycle, while the Security Classification Guide establishes the criteria for classifying information as confidential, secret, or top secret. The Handling and Storage Directive is primarily concerned with the physical protection and storage requirements for classified materials. Each of these documents plays a role in the overall security framework, but the Marking Classified National Security Information booklet specifically addresses the identification and marking of classified documents, making it the most applicable resource for this question.