As for me, I remember way back earlier in Reach forums when people were discussing the time travel theory: A theory that linked the Halo 3 legendary ending to him possibly traveling back in to planet reach during the fall.
[Edited on 10.05.2012 8:25 PM PDT]
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That if you bought a limited edition of COD MW2 you automatically got a call from the army asking if you wanted to be a sniper. They lied.