What is required for all documents containing originally classified information?

Standard markings are essential for all documents that contain originally classified information because they serve to clearly identify the classification level of the information contained within. These markings provide important details, such as the classification level (Top Secret, Secret, Confidential), the agency that originated the document, and any specific handling or dissemination instructions. This system of markings helps ensure that individuals who handle the documents are aware of their sensitive nature and understand the required precautions and restrictions associated with accessing or disseminating that information.

Effective use of standard markings not only aids in protecting national security but also facilitates the proper management of classified materials throughout their lifecycle. They are a critical component in maintaining the integrity and safeguarding the details of classified information.