hmmm, Something more on the Black beret group. maybe like Thier higher ups that are still alive, perhaps being corrupt due to, you know, the end of the world and all.
Some sort of cool twist to the whole thing though. Not just corrupt humans fighting over whatever, or hordes of zombies ( though there has to be hordes ) causing panic for the survivors.
I don't know, my brain shut down.
I'm sure whatever it is you end up giving us it will be cool as hell.