Prove me wrong.
[b][u]Edit:[/u][/b] Alright, it's been decided, Chief is either too awesome for Destiny, or he's a Hunter with Titan armor.
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Easy. In that trailer you took a screen shot of the chief turns around showing his armour which resembles a titan more than anything. Let's not forget some of his best abilites was a Bubble which resembles titan defender bubbles. I'm not sure how much more proof you need. Also he doesn't throw around knives, he punches things...