We're basically lumping all our Stormtrooper PC's into the 501st, so while I couldn't necessarily say you were placed with one of the 501st's commando teams, your character is indeed in that legion. Being part of the 501st doesn't grant automatic status as a Storm Commando, though, but you should ask Silverface that as he's the one who set up the 501st in the first place. Sorry I can't be of more help!