N.O.V.A. Near Orbit Vanguard Alliance

With Earth no longer able to sustain life, huge artificial satellites called 'near-orbitals' were constructed for people to live on. To protect themselves, the near-orbitals banded together to form N.O.V.A., the Near Orbit Vanguard Alliance. Against his will, retired marine hero Kal Wardin is forcefully returned to active duty to prevent mankind's annihilation.

Resumen: IGDB