What document must be overseen by the COMSEC custodian?

The correct answer is Communications Security information. This document encompasses the procedures, policies, and technical measures necessary to protect sensitive information during transmission and reception to ensure its confidentiality, integrity, and availability. The COMSEC (Communications Security) custodian is responsible for overseeing the safeguarding of this information, ensuring that all sensitive communications are properly managed and secure from unauthorized access. This includes maintaining the integrity of cryptographic materials, reviewing transmission logs, and ensuring compliance with established security protocols to prevent data breaches.

By maintaining oversight of Communications Security information, the COMSEC custodian plays a vital role in protecting national security interests and ensuring that critical communications remain confidential and secure from adversaries.