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Colony G21 is one of the many colonies established on The Frontier. It was founded by mutinous crew of the IMS Odyssey, who landed on the uninhabited planet Troy. Parts of the ship were then stripped to build the colony.
The Interstellar Manufacturing Corporation, while searching for members of the Frontier Militia First Fleet, assaulted and killed many civilians stationed in the colony, as well as burning down many buildings. The Colonists evacuated to the Odyssey and sent out a distress signal, which was picked up by the Militia fleet the IMC had been pursuing in the first place.
It is the home location of the map Colony and the campaign mission "The Colony."