What is a requirement for the classified documents in terms of marking?

The requirement for classified documents to clearly identify the classification level is crucial because it ensures that anyone handling the document is immediately aware of the sensitivity of its contents. This marking prevents unauthorized access and provides necessary guidance on how to protect the information according to its classification. By indicating whether the document is classified as Confidential, Secret, or Top Secret, it helps to uphold national security protocols and manage information appropriately within the confines of classified systems.

While cover sheets, proprietary markings, and color-coded markings may play roles in specific contexts or types of documents, they are not universally mandated requirements for all classified documents in the same way that identifying the classification level is. Knowing the exact classification helps inform personnel on handling and dissemination protocols.