A space colony in Mars settled in the 25th century (about a couple of centuries before the series' events). It has constantly suffered wars over the rich minerals found under its soil, acting as a decoy for powerful nations to take over the resources as its population suffers.
In the year 2599, a revolt of prisoners under the USC regime broke away from the prison they were held in, and with help from a few dissidents within the military they formed the rebel force that fights for the true independence of Arkagis.
United Space Colonies (USC)
The most powerful country in the 27th century, thanks to their economical and military strength. They pride themselves on "freedom", but in reality they're always meddling in every other country to entrench their own power.