Operation Downfall would require a global Allied armada

What would the naval side of an Allied invasion of Japan have looked like?

It would have drawn in nearly every available Allied and friendly navy, creating an armada larger and more multinational than the fleet assembled for any earlier operation.

The coalition would draw contributions from the United States, Royal Navy, Soviet Navy, Italians, Dutch, French, Poles, and potentially South American navies, with each sending whatever ships could be spared. The landing, escort, bombardment, transport, and support demands would be enormous. Even smaller allied fleets could supply useful hulls when the operation required every available ship. The result would be a multinational armada on a scale beyond any previously assembled.