Which department provides direct support to the Department of Defense?

The Coast Guard provides direct support to the Department of Defense (DoD) through its unique role and capabilities. As a branch of the military, the Coast Guard operates under the Department of Homeland Security in peacetime but can be transferred to the Navy during wartime or when the President directs. This dual mission allows the Coast Guard to support national defense operations, particularly in maritime security and law enforcement activities, which are vital for the protection of U.S. interests.

The Coast Guard participates in a variety of military operations and has capabilities that enhance maritime safety and security, thereby directly contributing to the DoD's overall goals. This includes missions related to counter-drug operations, search and rescue, and protecting maritime infrastructure. In this way, the Coast Guard's responsibilities align with and support the broader mission of the Department of Defense.