Alpha-Males: You can"t live with "em, but sometimes you can"t live without "em. An alien migration fleet -- 14,000 starships strong -- searches the stars for a new home, its homeworld forever lost. When they finally find planets that can support them, all they have to do is eradicate the pesky human natives, a task they assume is easily within their powers. But Earth"s Commonwealth of Worlds isn"t about to give up so easily -- even if it has to create and train something it hasn"t had for centuries: soldiers!