Which Cabinet position oversees the Department of Defense?

The Cabinet position that oversees the Department of Defense is the Secretary of Defense. This role is crucial as the Secretary of Defense is responsible for the formulation and implementation of defense policy, ensuring national security, and managing the Armed Forces. This position entails overseeing various branches of the military, coordinating with other government entities on matters of defense, and providing military advice to the President.

The Secretary of Defense plays a vital role in strategic decisions regarding defense strategy, military operations, and resource allocation for defense initiatives. Therefore, this position directly aligns with the responsibilities of managing and supporting the Department of Defense, making it the correct answer. The other options, while important roles within the federal government, do not have direct oversight of the Department of Defense.