From the introduction: "[T]he U.S. Army, U.S. Navy, and U.S. Air Force have each developed space capabilities that enhance landpower, seapower, airpower, and cyberpower, respectively. This decentralized context has shaped U.S. military thinking about space for the last 60 years. A product of this institutional structure is that current military theory and doctrine almost exclusively focus on space as an adjunct to other forms of military power without capturing the direct and independent impact space has on U.S. prosperity and security. The doctrine presented in the following chapters elevates 'spacepower' as a distinct formulation of military power on par with landpower, seapower, airpower, and cyberpower."
U.S. Space Force: https://www.spaceforce.mil/