They don't play a big part in the Beta. They're mostly just there to show you their role as gear vendors, and mission dispatchers while on patrol. We don't know much beyond this.
Again, we don't know for sure, but it is believed that you don't really [b]join[/b] factions. However, you can do missions for them, and represent them through gear emblazoned with their emblems.
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Oh okay I thought as much, I was genuinely more curious after doing some free roam missions and the future war cult was mentioned, presumably I was doing it for them. But thankyou for clearing everything up.