ALL YOUR FLUFF ARE BELONG TO US
http://www.immortalenemies.com/1stsgtsvlla_sm.jpg
Actually, the way I pictured this one working out is that our friend, here, Sulla, while a very cunning fighter, was not of the temperance to command a company. Coming from the more fanatical side of the Castigators, the self-hating kind of disfigured freak, he accrued many scars over the course of his many centuries of service. Most notably was a melta-bomb that went off in close proximity to his face, melting his scarred face and blinding him. The visage he wears now is no mask, but instead his actual steel plated (black carapace) lined skull. Etc etc.
1st Sgt may have to change, depending on our good friend and creator Mol. I frankly don't like the idea that you can't use "Master Sgt" because of Halo, because it is a real rank, but so is 1st Sgt.