That's Vrogy (Admin over at Halo Costuming Wiki and creator of the Halo 3 marine pep over there), I actually followed you down the stairs and asked for a photo when we got to the bottom (you had some kind of yummy orange mixed drink) and it turned out to be one of the best photos I took at the con. Great Guy cosplay man!
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I love the way the chrome reflects the light and creates a rainbow hue all around the wall!
Cheers,
Kensai