States Marine Corps component) Navy Space Command (maritime component) First Air Force (air component) Space Operations Command (space component) Joint Force Headquarters-Cyber Air Force (cyber component) Relationship with the United States Space Force United States Space Command is the unified combatant command for all military space operations, while the United States Space Force is the military service responsible for organizing, training, and equipping the majority of forces for U.S. Space Command. Space Command's Space Force service component is Space Operations Command, providing the majority of space forces. U.S. Space Command also consists of smaller amounts of forces from the United States Army, United States Marine Corps, United States Navy, and United States Air Force. This mirrors the relationship between the Space Force's predecessor, Air Force Space Command, and U.S. Space Command (and between 2002 and 2019, United States Strategic Command). History First establishment: 1985–2002 United States Space Command was established as a functional combatant command in 1985 to provide joint command and control of the Air Force, Army, and Navy's space forces, as well as prepare for the implementation of the Strategic Defense Initiative. In the aftermath of the September 11 attacks, the armed forces' focus on homeland defense and counter-terrorism was significantly increased, which resulted in space being deemphasized. It was in this context that the unified command plan was reevaluated, resulting in U.S. Northern Command being established for the defense of the North American continent, while U.S. Space Command was merged with U.S. Strategic Command, where its responsibilities were absorbed into the Joint Functional Component Command for Space and Global Strike. In 2006, this would be replaced by the Joint Functional Component Command for Space, and in 2017, be reorganized as the Joint Force Space Component Commander. The Army components for the first formation of Space Command were the Army Space Agency (1986–1988); Army Space Command (1988–1992); and Army Space and Strategic Defense Command (1992–1997), which eventually became today's Army Space and Missile Defense Command. Up until 2002 Naval Space Command was the naval component, and Air Force Space Command the USAF component. Second establishment: 2019–present The 2019 National Defense Authorization Act, which was signed into law in 2018, directed the re-establishment of U.S. Space Command as a sub-unified combatant command under U.S. Strategic Command; however, in December 2018, the Trump administration directed that U.S. Space Command instead be a newly established, full unified combatant command, with full