Which organization provides oversight for the global security cooperation of the Department of Defense (DoD)?

The Office of the Secretary of Defense (OSD) is the organization that provides oversight for the global security cooperation of the Department of Defense (DoD). This role includes the management and execution of security assistance programs, coordination of international military training and education, and oversight of defense-related partnerships with foreign nations. OSD ensures that U.S. security cooperation aligns with national security objectives and foreign policy goals, facilitating collaborations that enhance mutual defense capabilities.

In contrast, the other organizations mentioned do not have the primary responsibility for overseeing global security cooperation within the DoD. The Department of Homeland Security focuses on domestic security matters rather than international defense cooperation. The National Security Agency is primarily concerned with signals intelligence and information assurance, while the Central Intelligence Agency specializes in gathering and analyzing foreign intelligence, but does not oversee the broader aspects of security cooperation within the Department of Defense.