A IGN reporter said something about a class known as "Vangaurd" is this a real class, or a mix-up? If it is real is it usable at start or will be unlocked another way? or through DLC?
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If I had to take a shot at it, I would say that a Vanguard is a higher rank appointed to people with great seniority or who have contributed in some big way, not a class. Either that, or it will be to classes what recon was to armor in halo 3- A differentiating mark between staff and gamers, that regular players could obtain on very rare occasions.