The bridges around Alameda could also just be permanently raised since they are drawbridges. I even envisioned a make shift wall around the entire perimeter. Yes, it's a lot of resources but if there is oil from Bakersfield then they should be able to being up a concrete plant and make forms for a smallish wall section. Say 10 feet high and a foot or two thick. Just enough to discourage people and enough to stop small rounds.
I also see the main capital ships being the high endurance coast guard cutters. Anything bigger is too expensive in terms of parts and fuel.
As for population I personally se the bay area far less than 3 million. More like a few hundred thousand but That just my vision
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