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There's no default 4 way maps, so the feature wasn't included.[Edited on 07.29.2009 9:02 PM PDT]
4 teams of 4 CTF on foundation was great. It pissed me of they don't allow it in Halo 3, I'd make my own maps for it.
Let there be CHAOS!
Wait... what? I thought 4 team CTF was possible in Halo 3...