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If you look at the weapon the master chief is holding in one of the images on the front page image the chief is holding a weapon that looks exactly like the assault rifle used in halo 1.
I assume you mean they are introducing the AR back in to halo 3...so wouldn't it be more appropriate to post this in the halo 3 forum as another speculation thread?
-S
This isn't a Halo 3 forum.