Editing Operation Downfall (section)

===Naval forces===
Despite the shattering damage it had absorbed by this stage of the war, the [[Imperial Japanese Navy]], by then organized under the Navy General Command, was determined to inflict as much damage on the Allies as possible. Remaining major warships numbered four battleships (all damaged), five damaged aircraft carriers, two cruisers, 23 destroyers, and 46 submarines.<ref name="Japanese Monograph No. 85 pp. 16">[http://www.ibiblio.org/hyperwar/Japan/Monos/pdfs/JM-85/JM-85.pdf Japanese Monograph No. 85], p. 16. Retrieved August 23, 2015.</ref> However, the IJN lacked enough fuel for further sorties by its capital ships and planned instead to use its anti-aircraft firepower to defend naval installations while docked in port.<ref name="Japanese Monograph No. 85 pp. 16"/> Despite its inability to conduct large-scale fleet operations, the IJN still maintained a fleet of thousands of warplanes and possessed nearly 2 million personnel in the Home Islands, ensuring it a large role in the coming defensive operation.

In addition, Japan had about 100 [[Koryu class submarine|''Kōryū'']]-class [[midget submarine]]s, 300 smaller [[Kairyū-class submarine|''Kairyū'']]-class midget submarines, 120 ''[[Kaiten]]'' [[manned torpedo]]es,<ref name="Japanese Monograph No. 85 pp. 16"/> and 2,412 ''[[Shinyo (suicide boat)|Shin'yō]]'' suicide motorboats.{{sfn|Giangreco|2009|p=131}} Unlike the larger ships, these, together with the destroyers and fleet submarines, were expected to see extensive action defending the shores, with a view to destroying about 60 Allied transports.{{sfn|Giangreco|2009|p=257}}

The Navy trained a unit of [[frogman|frogmen]] to serve as suicide bombers, the [[Fukuryu]]. They were to be armed with contact-fuzed [[Naval mine|mines]], and to dive under landing craft and blow them up. An inventory of mines was anchored to the sea bottom off each potential invasion beach for their use by the suicide divers, with up to 10,000 mines planned. Some 1,200 suicide divers had been trained before the Japanese surrender.<ref>Zaloga, Steven (2011). Kamikaze: Japanese Special Attack Weapons 1944–45. Osprey Publishing. p. 43. {{ISBN|978-1849083539}}.</ref><ref>Barton, Charles A. (1983). "Underwater Guerrillas". Proceedings. United States Naval Institute. 109 (8): 46–47</ref>