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If Johnson was a part of the spartan class 1 and he has more experience under his belt then most of the military why is he only a sergeant major.[Edited on 01.12.2011 7:31 PM PST]
Old School
maybe so he can stay fighting on the front lines instead doin paperwork
"Find The Bomb?!Find The Bomb?!I'm Looking For The Flag!What The Heck Is Assualt!?"
The same answer for anything else in the Halo universe not specifically explained:ONI
do you see him sitting on a computer or doing something that doesn't involve a shotgun?