Who is responsible for overseeing compliance with government IT security regulations?

The responsibility for overseeing compliance with government IT security regulations primarily lies with NAVCYBERFOR, which is the U.S. Navy's command focused on cybersecurity and information assurance. NAVCYBERFOR provides guidance, policy, and oversight for the Navy's cyber operations, ensuring that all IT security measures align with federal regulations and military standards.

This entity plays a crucial role in developing and enforcing cybersecurity policies across the Navy, making it the appropriate answer. By managing and auditing compliance with necessary security measures, NAVCYBERFOR helps facilitate a secure operational environment that aligns with broader governmental IT security mandates.

The other options, while relevant in the context of IT security and awareness, do not have the same level of authority or responsibility. COMNAVCYBERFORINST 5239.1 is a specific instruction that outlines policy but does not oversee compliance itself. DoD IA Awareness pertains to the training and education of personnel regarding Information Assurance but does not oversee compliance directly. IAM refers to Information Assurance Managers, who implement security measures but are part of the broader structure rather than being ultimately responsible for compliance oversight.