[url]http://youtu.be/fcGKBUFD9qU[/url]
So far, from what I've gathered from other fans on the 343i site, it's closest to the venator armor though not the same, stirring questions as to why it's there and the possibilities behind it. Enjoy.
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Its probably Venator except unrendered (hence the absence of the reverse deltas on the visor).