It was mentioned that while squads -could- make certain archetypes a required membership, I think it was expressed that a wide variety of achetypes in each unit would be better so that a wider range of views and training could be emplemented to that specifics squads specialization. While obviously there will be some squads that have obvious benefits from a certain archetype, not all will be the case and it would be a way to avoid too much favoritism. For instance, each archetype will be trained within its own family, IE commissars (or whatever) training new commissars. if squad specificity was required in one or two squads it could hinder the ability for a commissar in squad A or cohors B to learn and grow if squad C is the family of most commissars. At least, this was my understanding of the concepts