The United States Space Force (USSF) is the space warfare service branch of the U.S. Armed Forces, and is one of the eight U.S. uniformed services. Initially formed as Air Force Space Command on 1 September 1982, the Space Force was established as an independent military branch on 20 December 2019, with the signing of the United States Space Force Act, part of the National Defense Authorization Act for 2020.

The U.S. Space Force is organized as a military service branch within the Department of the Air Force, one of the three military departments within the Department of Defense. The Space Force is headed by the Secretary of the Air Force. In terms of personnel count, it is the smallest U.S. armed service within the U.S. Department of Defense (16,000 individuals as of 2020).

The military head of the Space Force is the Chief of Space Operations (CSO). The CSO exercises supervision over the Space Force's units and serves as one of the Joint Chiefs of Staff.

The USSF's duties include protecting the interests of the United States in space deterring aggression in, from, and to space and conducting space operations.

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