Force in the closing stages of World War II in late 1945. Baika The was a pulsejet-powered kamikaze aircraft under development for the Imperial Japanese Navy towards the end of World War II. The war ended before any were built. The design was inspired by the manned version of the German V1 flying bomb, the Fieseler Fi 103R "Reichenberg". Boats Shinyo and Maru-Ni The were Japanese suicide boats developed during World War II. They were part of the wider Special Attack Units program. These fast motorboats were piloted by one man, to speeds of around . The Maru-Ni was an Army version with two depth charges the operator would drop and try to escape before detonation. Around 6,200 Shinyo were produced for the Imperial Japanese Navy and 3,000 Maru-Ni for the Imperial Japanese Army. Around 400 were deployed to Okinawa and Formosa, and the rest were stored on the coast of Japan for the ultimate defense against the invasion of the Home islands. Submarines Kaiten The was a torpedo modified as a suicide weapon, and used by the Imperial Japanese Navy in the final stages of World War II. Early designs allowed for the pilot to escape after the final acceleration towards the target, although whether this could have been done successfully is doubtful. There is no record of any pilot attempting to escape or intending to do so, and this provision was dropped from later production kaitens. The inventor of the Kaiten, Lt. Hiroshi Kuroki was lost during one of the first training missions. When the sub was raised, a note written during his final minutes before death was found, sending his respects to his family and detailing the cause of the accident and how to repair the defect. Kairyu The was a class of Suicide midget submarines of the Imperial Japanese Navy, designed in 1943–1944, and produced from the beginning of 1945. These submarines were designed to meet the invading American Naval forces upon their anticipated approach of Tokyo. These submarines had a two-man crew and were armed with two torpedoes and an internal warhead for suicide missions. Over 760 of these submarines were planned, and by August 1945, 200 had been manufactured, most of them at the Yokosuka shipyard. Divers were a part of the Special Attack Units prepared to resist the invasion of the Home islands by Allied forces. They were armed with a mine containing