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yeah same thing happened with my friend. Did you play online co op? if so were you the host?
The servers are probably just busy, it takes time to catch up with a few million players.
Whats up everyone
On my service record it says that I have not completed the campaign on normal in Halo 3, all it says is that i am in progress under legendary . But I have the achievement for it and the level achievments. Why is this happening. Help me Bungie.