Heres a good idea
Every time you get one squad member to level 60 that squadmember gains a class for you...Each squad member gets their own 5 classes and if you have one squad member level 60 then you get 6 classes for each squad member, then 7 if two members are level 60 and so on. You can get up to 15 classes(more perks, more diversity, more ways to make classes, 15 classes).
Could be that way maybe. dont really know since that part has not really be covered yet in anything released clear enough to really know.