The Joint Task Force–Space Defense (JTF–SD) is a joint task force and subordinate command of United States Space Command. It is responsible for executing control of space defense and space domain awareness units to protect and defend U.S. space capabilities.

The U.S. Space Force (USSF) is a new branch of the Armed Forces.The USSF was established within the Department of the Air Force, meaning the Secretary of the Air Force has overall responsibility for the USSF, under the guidance and direction of the Secretary of Defense.