Does he have PTVD caused by some horrifying experience in battle or even something involving family deaths? Or do you think he just prefers not to talk? If so, then why does he prefer not to talk? Anti-Social? Let's hear some possibilities. Be creative.
[Edited on 08.29.2011 10:29 AM PDT]
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He's buck sent back in time to help out himself in the past so he can get the team back together to get the engineer and his wife(in the future) to safety to give master chief the ability to save earth to get get stuck on a ship to make 343 make a sequel HALOCEPTION.