The Purpose of Establishment of the United States Space Force The Space Force was signed into law on Dec. 20, 2019, as part of the 2020 National Defense Authorization Act. SpaceForce.mil went live shortly thereafter. On June 18, 2018, President Donald Trump directed the Pentagon to begin planning for a United States Space Force: a 6th independent military service branch to undertake missions and operations in the rapidly evolving space domain. The Beginning of a New Military Service The U.S....