During World War II, Japanese Special Attack Units (特別攻撃隊 tokubetsu kōgeki tai?, often abbreviated to 特攻隊 tokkōtai), also called shimbu-tai, were specialized units of the Imperial Japanese Navy and Imperial Japanese Army normally used for suicide missions. They included kamikaze bombers, Fukuryu ("Crouching Dragon", suicide scuba divers), and several types of suicide ships and submarines.
The Yokosuka MXY-7 Ohka (桜花?, "cherry blossom") was a purpose-built kamikaze aircraft employed by the Imperial Japanese Navy Air Service towards the end of World War II. The US gave the aircraft the Japanese name Baka ("idiot").
It was a small flying bomb that was carried underneath a Mitsubishi G4M2e "Betty", Yokosuka P1Y Ginga "Frances" (guided Type 22) or planned Heavy Nakajima G8N Renzan "Rita" (transport type 43A/B) bomber to within range of its target; on release, the pilot would first glide towards the target and when close enough he would fire the Ohka's engine(s) and dive against the ship to destroy. That final approach was almost unstoppable (especially for Type 11) because the aircraft gained tremendous speed. Later versions were designed to be launched from coastal air bases and caves, and even from submarines equipped with aircraft catapults, although none were actually used this way.