Which group is responsible for assessing national security systems?

The Committee on National Security Systems is the correct answer because it is specifically established to oversee and evaluate national security systems within the United States. This committee plays a critical role in ensuring that national security systems meet applicable security standards and requirements, thereby safeguarding sensitive information and national interests.

The Committee on National Security Systems provides guidance and sets policies for the implementation and management of security across various governmental and military systems. By focusing on the protection of national security systems, it ensures a coordinated approach among various federal agencies, enhancing the overall security posture.

The other groups mentioned, like the Department of Homeland Security and the FBI, have important roles in national security, but their responsibilities are broader and not specifically focused on the assessment of national security systems. The Center for Cybersecurity Standards, while relevant to cybersecurity, does not hold the same specific mandate regarding national security systems as the Committee on National Security Systems.