Back when I served in the sub service, there was one boat that was painted up just like that one. The pic says this one is Ohio class, where as ours were Lafayette class. Which means that they carried on the tradition. Nice to know.
As to the 16th hatch markings, sorry, I don't remember if was white for a cueball, or something else painted on it.


But, to be fair, it's also very possible that I never saw that hatch's markings as you either have to be on the sub, or have it facing the correct way for you to see it.