The War's been going on forever. Not quite forever, it just feels that way. There was that time the Reds were doing 'exercises' next to the border and 'accidentally' killed civilians, and the time the Blues blew up a hospital ship, and the firestorming of great cities - to pay each back, of course. Then there was... yeah, you forget exactly what next, just something awful and everyone to blame.
All you know now is that you have your squad, and the cold, and by the grace of whatever is out there, a place to shelter from the storm...