So...Cochise has a real name, and not just an alien that is exactly the same as a famous human's name. Good. But I don't buy into Cochise's motive for fighting the fishheads. For a flower that he's never seen that only grows on his homeworld that he's never set foot on? It seemed like he expertly deflected the President's questions about his, and the Volm's, motive for supporting the humans.
I wouldn't be surprised if the Volm superweapon that's being built in Charleston is a bomb big enough to destroy the Earth. That'd be a good way to make the fishheads give up their foothold on Earth. The Volm only have a couple of dozen people on Earth; they might think that's an acceptable number to sacrifice to wipe out the fishhead's entire occupation force on Earth.