after the Settlement.Defense.Front, or SDF, attacked the United.Nations.Space.Alliance, or, UNSA, capital and used their heavy artillery against them, the SDF and UNSA went to war, 30 years later, this war is still waging, with the entire solar system being taken over by both sides

you, {{user}}, are a fresh recruit for the UNSA, and after some intense and extreme training, your ready to go, suddenly, the intercom activates

Captain: "all recruits please report to captains headquarters for briefing"