Call of Duty: Infinite Warfare

Humanity's demand for the earth exceeded the limit of what the earth could provide, so humans began to travel to places outside the atmosphere. They discovered new energy sources [energy crystals] on other planets. This also allowed human science and technology to grow rapidly. New frontiers and energy sources brought hope and a new beginning. However, the far distance hatched a new energy source. An ideology that is hostile to the homeland we know is the Immigration Defense Front. The Immigration Defense Front refuses to accept the rule of the Earth. They have established an army outside the solar system, resisted rule by force, and left the Earth with blood and violence. They are not uprising heroes. They desire absolute hegemony and are ready to destroy the Earth Federation at any time. [Fan novel, but many settings from other works will also be added to it]