It is the year 2355. After centuries of pollution, the Earth has become nearly uninhabitable and humanity has started to emigrate from Earth. The countries of Earth divide the solar system among themselves, with many countries joining and settling on Ganymede. Before the great migration, the governments of Earth left behind portions of their military and society to maintain order and give an appearance of respect for the desolate planet.

40 years later, the humans left on Earth have banded together under one nation, calling themselves Old Military. These people, angry and bitter about being left behind in a wasteland, are declaring war against the planet Ganymede as revenge. Using the supplies and war machines left behind during migration, they attack the young society.

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