The novels were retarded with explaining multiple S.T.A.R.S. branches all over the country. It completely defeats the point of S.T.A.R.S. Look, Raccoon City is the only city with a S.T.A.R.S. team. Why? Because S.T.A.R.S. is THEIR version of S.W.A.T. teams. Raccoon City didn't have S.W.A.T., and instead had S.T.A.R.S. And why only two divisions? Because Raccoon City, however massive of a city it really was, it was still only a mountain city further away from other cities. They didn't really have a bunch of constant S.W.A.T./S.T.A.R.S. neccessary situations. And as for incorporating new S.T.A.R.S. teams in the series now, it would just be stupid. Because Raccoon City is levelled to a pile of grandma ashes. There is no R.P.D. Police to have a new S.T.A.R.S. team.
Oh, and if you haven't noticed... I liked using my acronyms in this post.