@AccidentProne Not that I could see. I might have missed something obvious, but it looks like the game assigns them automatically when they become squaddies. Not sure if that is based on what they actually did in the missions though. You also get missions where you can get specific class soldiers at advanced ranks as well - really handy when they come up assuming you are in a position to take that mission.|
Oh, there is a perk called "New Guy" that you can get in the Officer training school that will set all your soldiers to squaddies so you can then see what classes they are.