According to US media, the space force may be the youngest service of the U.S. Army, but it already has 10 units stationed abroad, as well as facilities in Greenland, the United Kingdom, Ascension Island, digogacia Island, Alaska, Hawaii and Guam. < p > < p > according to the US “Star Spangled Banner” website on August 17, as part of the “fiscal year 2020 National Defense Authorization Act”, the service was established on December 20 last year, with 16000 military and civilian personnel. The Pentagon’s first space force budget proposal calls for $15.4 billion in 2021. “Due to the military, security and economic importance of space operations, most large countries now have a global network of facilities, and the United States is no exception,” Braden Allenby, a military technology expert and professor of engineering at Arizona State University, said in an email on August 7 The space force is headquartered in the Pentagon and its mission is to organize, train and equip troops to protect the interests of the United States and its allies in space, and to provide space capabilities to other services. The mission of the service is to “maintain and strengthen the U.S. competitive advantage in space while adapting to new strategic challenges Maintaining space superiority is an emerging capability needed to protect U.S. space assets from hostile attacks. “. The space force has satellites for military and commercial missions, provides satellite communications and navigation to the military, and monitors ballistic missile launches around the world. Its motto is “always up.”. < / P > < p > the sites identified on its website are Buckley, Shriver and Peterson Air Force bases in Colorado; Los Angeles and Vandenberg Air Force bases in California; and Patrick Air Force Base in Florida. Materials and pictures: US President trump announced the formal establishment of us space command on August 29, 2019. The picture shows us president trump (second from right), vice president burns (first from right), US Defense Secretary esper (second from left) and John Raymond, commander of the US Air Force Space Command, attended the inauguration ceremony of the space command. (Xinhua News Agency) < / P > < p > the 12th space early warning squadron at Tulle air force base, Greenland, uses an early warning radar to track missiles and objects in space. Digogassia island in the Indian Ocean is home to task force 2 of the second space brigade, which operates an electro-optical deep space surveillance telescope. < p > < p > Ascension Island in the Atlantic Ocean is the base of the 45th space wing’s second space task force, as well as a mechanical radar for space surveillance missions. Anderson Air Force Base on Guam has a satellite tracking station, which is part of the U.S. Air Force’s satellite control network and is headed by task force 5 of the 22nd space operations squadron. “There are no plans to expand the space force’s overseas presence beyond its current level,” space force spokesman Lynn Kirby said in an e-mail on August 6 “However, the space force is in its infancy, with the initial process of transferring some (air force) professionals and existing forces to a new entity,” he said. Most of the new space forces are centered on domestic bases. ” The space environment is rapidly evolving and somewhat unpredictable from a technical and geopolitical point of view, and therefore, the foundation of the service may continue to change, arenby said. “I expect that after the initial merger, we will see a more strategic and thoughtful allocation of resources and facilities, which may be quite different from what we are in now,” he said “The way space science and technology is developed – especially given geopolitical tensions – suggests that not only (the air force), but also our adversaries will appear at bases in near space, and perhaps the moon,” Ellenby said However, a treaty signed by the United States and in force since 1967 stipulates that the moon can only be used for peaceful purposes, and specifically prohibits “the establishment of military bases, facilities and fortifications”, as well as the conduct of weapon tests or military exercises. < / P > < p > some trends suggest that the future may be different. For example, military operations and space bases may require private / public / military institutions and personnel, arenby said.