Halo 3: ODST drops on September 22, and features a new cooperative multiplayer mode – Firefight. Firefight will put you to the test as you and your friends assume the role of an ODST squad and fight together to take on increasingly challenging waves of enemies. If you pre-order Halo 3: ODST at participating retailers, you will receive a token to unlock UNSC hero – Sgt. Johnson as a playable character in Firefight.