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Type 5 15 cm AA Gun
The was a large caliber anti-aircraft gun developed by the Imperial Japanese Army during the final days of World War II. The Type 5 number was designated for the year the gun was accepted, 2605 in the Japanese imperial year calendar, or 1945 in the Gregorian calendar.〔War Department TM-E-30-480 ''Handbook on Japanese Military Forces'' September 1944 p 400〕 It was intended to replace the earlier Type 3 12 cm AA Gun as a defense against American air raids.
==History and development==
In order to address the shortcomings of the Type 88 75 mm AA Gun, the Army Technical Bureau developed a larger version with superior range, designated the Type 3. It was one of the few weapons in the Japanese inventory capable of reaching the USAAF B-29 Superfortress bombers that were attacking cities and other targets in the Japanese home islands.〔Bishop, ''The Encyclopedia of Weapons of World War II''.〕 However, by late 1943 it became apparent that the B-29 was capable of flying at altitudes in excess of 10,000 meters, beyond the effective ceiling of the Type 3 12 cm gun.
An emergency project was initiated in December 1943 to address this issue. To save time, the existing Type 3 design was scaled up to 15 centimeters in caliber, with a corresponding increase in range and firepower. The project was completed relatively quickly, with test guns ready for firing 17 months after the project starting. However, by this point it was already too late — all major Japanese cities had been destroyed by the strategic bombing campaign against Japan, and American bombers were moving onto secondary targets. Japan lacked the raw materials and industrial infrastructure to follow through with mass production. Only two units of the powerful new Type 5 were completed before the surrender of Japan.〔() Taki's Imperial Japanese Army〕 One unit each was produced by the Army’s Osaka Arsenal and by Japan Steel Works.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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