It's an Admiral's Bathtub, for Bathtub Admirals! XD

(just kidding )

Seriously though, the USS Iowa is actually the only US Navy warship that was ever outfitted with a bathtub, and it was installed into the guest quarters' head especially for the US President (who was expected to make several round trips on-board the Iowa).

Franklin Roosevelt, Harry Truman, and likely several other US presidents washed-up using this tub.


And before you ask, I did NOT try to use it to see if it still works.