The AUA is the planetary military of Arin.
Unlike the AE, a planetary military only has jurisdiction within their own systems. In times of emergency, they can form an Alliance, which grants them Carte Blanch to act within the region of the Alliance.
Thus, in most cases, Planetary militaries only act as a self defense force against unexpected Beast incursions until the AE arrives.
The AUA is probably the most extensive of the single system military forces shown. It has it's own high level warships, an orbital elevator, Knights from the Central Order often attach themselves to the AUA and the planet has a comprehensive orbital defense network.
The following Characters are part of the AUA.