I mean they could have at the very beginning at the least and then changed it when he found infinity. The multiplayer Mark VI armor is far more similar to the Halo 3 model than what was forced upon us in the campaign.
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[quote][b]Posted by:[/b] Black Eagle X99 when the Didact attacks Earth where was the entire UNSC fleet and their orbital MAC defense grid?[/quote] All of the fleet got absorbed into the Infinity.