And I'm done. 10 Calvary was all I needed, the white horse is pretty cool. Well technically my Medic is only level 7, but I already have the Selb 1906 from earlier. So everything is level 10 and unlocked.
Speaking of the progression system, it's bad. You pretty much unlock everything by levels 3/4 and after that there is nothing until level 10. I can see how people that don't play the game a lot benefit from it. However, for the people that actually put in a lot of time there is nothing for them.