@Dalek: they vanished, but the perceived threat never really did... the whole military was basically created to hunt the other race down, so that's who they are (still) at war with. They aren't attacked often, which is why I didn't mention it (though in hindsight, I probably should have)... it's more of a cat and mouse kinda war than anything. It's much more complicated than this explanation, but I can't really go too far into things without giving the plot away. I promise I didn't leave some giant plot hole in my story. (and thanks for pointing that out)
Oranges_and_Pears: yeah... that's kinda an understatement.