Ok, I don't know if I'm the first, but to destroy the AA gun in the Storm really easy, just charge up a Plasma Pistol and fire it. Stop trying to blow it up with freakin Fuel Rods 'n Rockets, it takes longer. Though I would like to share that with you. Also charged up Plasma Pistol shots home in on armored Brutes, Jackal shields, and most other kinds of shields, including the part on the AA gun.
plasma pistol is infinite win in Halo 3. It does SO MUCH. That is why you can only build 8 on a map in forge.
all u need to beat halo 3 legendary is plasma pistol and br and stickes the rest is all easy and maybe a b ubble sheild here and there
Plasma pistol was almost the ONLY way you could win h2 on legendary. There is too little ammo, especially when you come up to fights with like 3 spec ops and 2 gold elites with swords. Man i miss pwning spec ops. Also the scarab on the storm, you can kill it in like 3 shots witha sniper rifle, from the start point. Insta-win
I normally just get on it and keep pressing 'b' ... although I did see a glitch where you can attually drive the AA wraith! http://www.youtube.com/watch?v=QoI0Ap9fUdU&feature=related