the key factors are weight, provision of suitable attachment points, and launch speed. Assisted torpedoes are the most recent development in torpedo design, and are normally engineered as an integrated package. Versions for aircraft and assisted launching have sometimes been based on deck or tube launched versions, and there has been at least one case of a submarine torpedo tube being designed to fire an aircraft torpedo. As in all munition design, there is a compromise between standardization, which simplifies manufacture, and logistics, and specialization, which may make the weapon significantly more effective. Small improvements in either logistics or effectiveness can translate into enormous operational advantages. Use by various navies French Navy German Navy Modern German Navy: DM2A4 heavyweight torpedo DM2A3 heavyweight torpedo MU 90 lightweight impact torpedo Mark 46 torpedo Barracuda (supercavitating torpedo) The torpedoes used by the World War II Kriegsmarine included: G7a(TI) G7e(TII) G7e(TIII) G7s(TIV) "Falke" G7s(TV) "Zaunkönig" Armed Forces of the Islamic Republic of Iran Islamic Republic of Iran Navy Type 53 torpedo TEST-71 torpedo Valfajr torpeo Islamic Revolution Guard Corps Navy: Hoot torpedo Italian Navy The Italian Navy uses two types of heavyweight torpedoes, both developed and produced by Leonardo: A-184 torpedo on the Sauro-class submarines Black Shark torpedo on the Todaro-class submarines Imperial Japanese Navy The torpedoes used by the Imperial Japanese Navy (World War II) included: Type 91 torpedo Type 92 torpedo Type 93 torpedo (Long Lance) Type 95 torpedo Type 97 torpedo Kaiten Japan Maritime Self-Defense Force Modern Japan Maritime Self-Defense Force: Type 72 torpedo Type 73 light weight torpedo Type 80 torpedo (G-RX1) Type 89 torpedo (G-RX2) Type 97 light weight torpedo (G-RX4) Type 12 light weight torpedo (G-RX5) Indian Navy Takshak (heavy weight torpedo) Varunastra (heavyweight torpedo) Advanced Light Torpedo Shyena S.M.A.R.T. Royal Canadian Navy Torpedoes used by the Royal Canadian Navy include: MK-48 Mod 7 Advanced Technology (AT) Torpedo Royal Navy The torpedoes used by the Royal Navy include: Spearfish torpedo Stingray torpedo Tigerfish Mark 8, designed in 1925, last used in action in 1982 Russian Navy Torpedoes used by the Russian Navy include: Type 53 torpedo Type 65 torpedo APR-3E torpedo VA-111 Shkval torpedo 65-76A 100 km In April 2015, the Fizik (UGST) heat-seeking torpedo entered service to replace the wake-homing USET-80 developed in the 1980s and the next-gen Futlyar entered service in 2017. U.S. Navy The major torpedoes in the United States Navy inventory are: the Mark