i need help on halo 3 campaign on legendary?

[th3 bo55]

can anyone help me beat halo 3 on legendary
if yu can help me just add me on xbl and send me a message saying ur gona help me
my gamertag is urboybrian210

 

[bob]

cool. I have an xbox live account to but i dont want to give it away because its not all mine i share it with other people like my brother.