Avalon is the principle space colony under The Galactic Alliance's rule. It has a population of 470 million citizens. It is to be protected from the Hideauze at all cost.
All we know
Avalon is a beautiful colony, sometimes called the "homeland" or "paradise" of the Alliance. The inhabitants enjoy freedoms such as the right to sleep, eat, drink, and reproduce as they see fit. Chamber explains that after being released from active duty, a soldier is allowed four weeks visitation privliages.