That's not a cloak that's a poncho! He doesn't use a knife! He punches things!
English
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By definition a Poncho is not a cloak, as shown above, a poncho, or original ponchos, did not have hoods, and is a one layered sheet of cloth, with patterns and designs on it. And yes, Chief has a knife, as seen above.
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But he didn't use it until halo 4 so...
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Still used it. And he used it with style. Technically Chief doesn't punch his enemies, he hits them with his gun.