And none of them are likely able to be operational without years of costly refits, and that's with TODAY'S level of technical support, experience, and personnel. Doing it after 80(?) percent of the world's population died would likely be impossible. And pointless, as so many 100% operational ships were probably just tied up in ports all over the world ready to refuel and sail away. Last active one was almost 30 years ago, and they've likely been cut up a bit for use as museums. Unlike Nathan James, recovering from being a museum piece isn't just removing the velvet rope and tossing the cardboard cutouts overboard; for a lot of these ships, they change them structurally so that you can walk through it in a more normal way instead of how it would exist as a war ship. To be fair, the Iowa class has recovered from some lengthy mothball periods since they were built in the 30s/40s, but they were always kept stored in a way to help with that. As a museum piece, not so much. Things weren't removed with an eye towards being able to put them back again. And like i said, the support personnel, shipyards, experienced people you need to support that effort probably don't exist anymore in this fictional history.
And same problem as with the carrier discussion above: takes a metric ass ton of people to run that ship. If you have enough trained people to run one, you have enough for dozens of other ships instead. And they are armored all to hell for sure, with nice big heavy guns, but the tech on that just doesn't make sense in an age with smart bombs, guided missiles, etc. There are several reasons we don't make them anymore; the age of the battleship is over.
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