I think it might be nicer to have futuristic classes instead of factions. Factions are like cowboys and Indians or gangsters and cops right? Well if so, I think Zone is not fit for that.
A faction is just a category, basically a class. It can be any name.
I still don't think that zone is fit for that kind of thing anyways. Futuristic classes, work together or fight against each other. It's all about the skills and the role you play in the battle field