And he wouldn't be able to get all of them anyway because certain commendations are reserved only for specific branches of the military, for example, the Coast Guard Distinguished Service Medal. He wouldn't be able to be awarded this due to being in the Navy, so he would instead be awarded the Navy Distinguished Service Medal in its place - meaning it is impossible for him to have earned EVERY medal in the UNSC. Perhaps the UNSC Navy, which is like... 30-something. And I am assuming in total the UNSC has about 150-something medals total after counting out how many awards the US military has right now, like 130.
[Edited on 01.27.2012 11:46 PM PST]