Why is it necessary to mark all documents containing classified information?

Marking all documents containing classified information is essential for ensuring proper handling and awareness. This practice helps personnel quickly identify the sensitivity of the information contained within a document, which dictates how it should be managed, accessed, and protected. By clearly marking classified documents, individuals are made aware of the specific precautions that must be taken to prevent unauthorized disclosure. This visibility supports compliance with security protocols and establishes a culture of accountability regarding classified materials. Proper marking helps mitigate the risk of insider threats by reinforcing the significance of safeguarding sensitive information and promoting adherence to established procedures within the Department of Defense and related entities.