Which department does the Space Force belong to?

The Space Force is part of the Department of the Air Force, which also includes the United States Air Force. This structural organization allows for specialized operations and resource sharing between the two military branches. Established in December 2019, the Space Force was created to protect U.S. interests in space and to conduct space operations. By being part of the Department of the Air Force, the Space Force can leverage existing Air Force infrastructure and expertise while maintaining its distinct mission focused on space.

The other options do not accurately represent the current organizational structure of the Space Force. The Department of Defense encompasses all military branches but does not serve as the direct oversight body for the Space Force. The concept of a Department of Space does not exist within the current U.S. governmental structure, and the Department of Homeland Security primarily focuses on domestic security and does not control military branches.