The main character starts in a colony ship which is attacked by pirates his family is killed and he is kidnapped and enslaved by the pirates. The pirates get attacked and killed by a winged, alien species.
This species is very traditional and trains him to be a spy and assassin. He is then sent on graduation to a space station to enlist in the human armed forces. He is then trained on a cruiser then graduates and becomes a lieutenant, I think, and then goes and fights pirates on this cruiser. He then finds the same space pirates who attacked his colony ship and ends up finding his younger brother.
Can anyone tell me what this book is called? It's also a little more mature of a book, for it has implied rape.