We could use Baltham & Bainbridge; an isolated island city could be a good testing ground but at the same time it becomes a lot easier for the military to “handle” it when it gets out of hand— and harder for any characters to get the fuck out of dodge with the inclusion of no fly zones and other situations. The only alternative I have are made up cities in more conventionally open areas. Parris City, Grant City (I reuse this one way too much), etc. 

I’m completely okay with B&B, but I’m just airing points that might make story progression kind of claustrophobic.