What if USS Iowa BB-61 were replaced by Iowa BB-4 during the Second World War?
Short answerThe old battleship would probably be scrapped, or perhaps used as a museum or war-bond attraction, because it could not replace Iowa's combat value.
NotesReplacing Iowa BB-61 with the old Iowa BB-4 would leave the US Navy without a useful substitute for its modern battleship. The pre-dreadnought would probably be scrapped for its metal. A museum or war-bond display is the more optimistic alternative. Neither proposal gives the old ship a combat role equivalent to Iowa's.