Not too up on such things but I'm sort of shocked the US only has 10 considering the size of the world, although, I suppose the entire state of Alaska does put the US in a solid strategic face to face in an important region.
Speaking of big boats, I remember the Navy's USNS Mercy and the USNS Comfort that were pulled to the NYC and LA harbors late March of 2020, I had no idea we had those before then. I think there is a whole lot our military has at the ready I can't even imagine.