You've kept it clean watching the teaser, now watch the full trailer for the brand new Bungie stand-alone expansion, Halo 3: Recon. The title was kept under wraps begrudgingly by Bungie, but now, the world of Halo fans can get amped for what's ahead.
You'll take on the role of a UNSC Orbital Drop Shock Trooper who crashes into a hostile period leading up to the events of Halo 3. The new campaign starts Fall 2009.
Halo 3: Recon TGS Trailer