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 for ensuring that everyone who handles the document understands its sensitivity and the necessary precautions that must be observed. Classification markings indicate whether a document is classified as Confidential, Secret, or Top Secret, and this information is vital for protecting national security interests. Properly identifying the classification level enables individuals to manage the information according to established protocols, ensuring that access is limited to authorized personnel only.

While cover sheets, proprietary markings, and color-coded markings may be important in certain contexts or organizations, they are not universally required for all classified documents. The clear identification of the classification level is a fundamental requirement across all classified information handling practices.