Dione

Originally a poor, suburban backwater world that relied heavily on importing resources from neighboring worlds, Dione was initially terraformed and settled in the late 2150s by immigrants from Earth. For a century, Dione remained a sparsely populated residential world with low wages and a low cost of living. During the Solar Civil War, the Rebellion established its largest regional military presence on Dione and built a sprawling military facility on the northern pole. Throughout the 9 years of conflict, the complex on Dione grew and grew. When the war ended, construction of the facility was not halted - on the contrary, it was expanded until it covered nearly half the moon. Residents who lived in the way were forcefully relocated to the other side of the world, and huge swaths of undisturbed natural land were carved out to make room for underground quarters and hangars. In 2176, the Republic founded the Space Armada Naval Academy inside the Dione Military Complex, where it has remained the ROT's most prestigious officer school. The base is garrisoned by several billion soldiers at any given time, who are frequently rotated out into other stations. Millions of officer candidates travel to Dione each year to compete in the rigorous admissions examination, while the soldiers there are required to participate in war games, drills and simulations in order to help teach leadership skills, tactics and strategy to prospective commanders.