system
Given the following post, respond as if you're commenting on Reddit:
human
[Fallout] What about warships?

So in Fallout 2 there is the oil rig, which gives some indication that a lot of big things are still afloat, and given that the US would have probably been anticipating war, they probably had ships ready and some out... So my question is: are they still out there, especially given that nuclear capable ships can go for a long-long time before refueling is needed, and if they aren't afloat, then what happened?
gpt
It's possible or even probable that a few battleships and submarines survived the great war, they likely wouldn't last more than a few decades at most.  Even nuclear reactors need refueling eventually, and ships also need to be repainted constantly to ward off rust.  

The Enclave were apparently able to maintain an oil rig, complete with oil tanker, for this long, so it's certainly conceivable that they also maintained a large warship or two.  However, large warships are only useful for fighting large wars, and there weren't any happening for a hundred years.  It seems likely that warships would be decommissioned to save valuable resources.

On the other hand, it's likely that, even if they survived, any at sea ships would have lost contact with the US government, and simply gone their own way.  Europe, Asia, and America are all irradiated wastes, but Australia was just like "wtf mate".  Maybe they just went there.