Halo 2 Legendary: Beat the boarders, Cairo Station, second landing bay
This tactic can make getting past this section a lot easier on legendary. When you walk into the room, go to the right, into the room and up the stairs. K[ill] the Grunts on the turrets, then look for a crate next to one of the guns. Choose the gun you want to man (preferably facing the enemies), and melee the box directly behind it. Try to position the gun in the center of the box. Now, press X to man the turret. You should go into the box, and be sticking partially out, but still able to aim and shoot. In this position, so long as you positioned the box well, the Covenant won't see you, even as you fire the turret at them. [Halo 2 Trick FAQ by Kyle Barr].
Also, see Cairo Station Legendary Walkthrough for other hints for this level, and Halo 2 Legendary Tactics & Walkthrough for general Legendary hints.

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