Credit to Microsoft and Bungie, 'cause they really know how to put together a nice promotional movie, as evidenced by this new Halo 3 ODST live action trailer. War is hell, but also very cool when Covenant Brutes are involved.
The live action sneak peek at Halo 3 ODST is after this, courtesy of IGN.
Halo 3: ODST Xbox 360 Trailer - Live-Action Trailer [IGN - thanks, Jesse!]