Which organization coordinates COMSEC matters unique to the USMC?

• A. KMA (Key Management Authority)
• B. HQ Marine Corps (C4 CY)
• C. Navy Communications Material System
• D. Central Office of Record

Answer: (B)

The correct answer is the HQ Marine Corps (C4 CY), as this organization is tasked with overseeing and coordinating all matters related to communication security for the United States Marine Corps. The C4 Cyber Systems Division within the HQ Marine Corps plays a vital role in ensuring that communication and information systems used by the Marine Corps are secure, reliable, and effectively managed.

This includes the development of policies, procedures, and standards necessary to maintain the integrity, confidentiality, and availability of sensitive information. In the context of COMSEC, the HQ Marine Corps (C4 CY) is responsible for implementing and overseeing the necessary controls and practices that protect communications and data from unauthorized access or exploitation.

Other organizations listed may have roles related to communication security within their respective scopes, but they do not specifically coordinate COMSEC matters for the Marine Corps. For instance, the Key Management Authority is more focused on the broader aspects of key management across various branches of the military, while the Navy Communications Material System and the Central Office of Record have specific functions that do not pertain to the Marine Corps' unique COMSEC requirements.