We have a nice, fat update today, with lots of Halo 2 and Halo 3 stuff for you, including some interesting new art.
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I doubt we will be able to call in air support, but the other things are feasable. And we know the bubble shield and tripmine are in the game, so why not be able to deploy a turret, Sgt. Jonhson does this in the first level of Halo 2.