So, im playing as the soviet navy at lvl 32. I was gunning for the lvl 34 cl, but then i realized, i might like to play as cv for a while. So, if i were to choose the lvl 34 ship, i would only be able to do SS and CL CA and BB? Or once i get fairly far in the CL CA, BB can i go back, reaserch the first ship in the CV class and work my way up that side of the tree with the same BO?