The cognizant security office for the DoD is known as which agency?

The cognizant security office for the DoD is known as the Defense Information Systems Agency (DISA). DISA plays a crucial role in the provision of communications and information technology support to the DoD and its partners. This agency not only handles operational security measures but also ensures the integrity and availability of information systems across the defense sector.

In the context of security, DISA provides guidance and oversight for various security programs, making it central in administering the security requirements for information systems used by the DoD. Its involvement in setting security policies, providing compliance checklists, and offering support services highlights its responsibility in maintaining the security posture of DoD information systems.

This option accurately reflects the agency responsible for overseeing security operations within the DoD, distinguishing it from other agencies that might have specific functions, such as intelligence gathering or cybersecurity defense, but do not serve as the primary cognitive authority over security matters for the entirety of the Department of Defense.