So this came up on tumblr, I thought I'd see if anybody here has any thoughts.
People make a huge deal out of Corporal Levi, but 'corporal' is actually really really low on the military scale. He's not even an officer, he's barely more than a private. Even taking into account that their military structure may be a bit different, I'd find it difficult to bump him up too many ranks.
So we've got this super-mega-awesome titan slayer who's stlil at the bottom of the military hierarchy, and that's actually kind of weird. Why hasn't he been promoted?
Personally, I wonder if there's not something intentional behind it. Maybe he's being kept down so he'll be on the field a lot, doing what he does best. Or maybe he himself doesn't want to be promoted, 'cause he doesn't want to deal with officer responsibilities.
Shingeki no Kyojin