Here are some fresh new Halo 3: ODST Firefight co-op mode Expansion screenshots. Its slated for release exclusively for the Xbox 360 on September 22nd 2009. So its not too far off! Check out the gallery below:

Developed exclusively for Xbox 360 by acclaimed developer Bungie, “Halo 3: ODST” is a new game in the “Halo” saga that lets people experience events leading up to the epic story told in “Halo 3″ through the eyes of an ODST (Orbital Drop Shock Trooper), as they search for clues leading to the whereabouts of their scattered squad and the motivations behind the Covenant’s invasion of New Mombasa. The release adds a new dimension to an all-encompassing universe that gamers around the world have known and loved for close to eight years.