Secretly passenging pelican
Go to the map "assault on the control room" then, as soon as you leave the pelican, hold action button (defualt being 'X') and you're in pelican enjoy! (sorry if you known of this cheat or blah, blah, if I copied I did not mean to)
More tricks, tips and cheats for this game are right here - Halo: Combat Evolved Anniversary cheats
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