The temp track is obvious. They're some inspiration from WILD AMERICA by McNeely and most obviously from STARSHIP TROOPER. The theme we hear in the 4th track is the same as the "--BUG"-- theme composed by Poledouris.
Neverthless, it's a big surprise since it's a Rabin's score and it doesn't sound to his others works very much (except at the end of the track one, when he begins a kind of Armageddon march...).
Really nice surprise !
It's more a peaceful score... not a Pirates of Caribbean stuff... even if it's a war movie...