[@CommisarJhon] Hey! Glad to see that you're interested. The fighting/draft age is probably around eighteen, though it's likely that seventeen year olds won't be turned away or anything like that. With Liberty, I would say that the actual proper names of the role depend on the sector, but it goes

Leader
Councillor
Speaker/Upper Supervisor
Area Supervisor
Agent
Worker
Beginning Worker/Specialized Trainee
Regular Trainee

I may make edit to the roles of Liberty workers and shift things around if I find things don't work in the way I was hoping, or even add some roles (given that I realized it might be a bit lacking when compared to Erubesco), but this is the list that I'll go ahead and add to the main post in a bit. I hope this helps!