Who is primarily responsible for marking classified information?

The primary responsibility for marking classified information lies with the originating agency or authorized personnel. This is because these individuals or entities are best positioned to understand the specific context and sensitivity of the information they produce. They are tasked with accurately determining the classification level, applying appropriate markings, and ensuring that the information is handled in compliance with relevant policies and regulations.

This responsibility is critical as it safeguards national security interests and ensures that sensitive information is properly protected. Each agency has established protocols and trained personnel to correctly assess and mark information, which reinforces accountability and clarity regarding how the information should be treated by others who may access it.