The 120 mm Gun M1 was the United States Army's standard super-heavy anti-aircraft gun, complementing the smaller and more mobile M2 90 mm gun in service. Its maximum altitude was about , which garnered it the nickname the stratosphere gun. The 120 served primarily in static defensive roles, although it had been designed to be mobile. One battalion, the 513th AAA Gun Battalion, did make it to the Philippines in February 1945, although they never fired their guns in anger. There is also speculation that some 120s arrived in England in early 1945 to provide air defense for London, although no concrete evidence of this has been documented. The M1 gun was used in air defense, from 1944 through the early cold war period when the system was gradually phased out with active duty units,beginning in
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| - The 120 mm Gun M1 was the United States Army's standard super-heavy anti-aircraft gun, complementing the smaller and more mobile M2 90 mm gun in service. Its maximum altitude was about , which garnered it the nickname the stratosphere gun. The 120 served primarily in static defensive roles, although it had been designed to be mobile. One battalion, the 513th AAA Gun Battalion, did make it to the Philippines in February 1945, although they never fired their guns in anger. There is also speculation that some 120s arrived in England in early 1945 to provide air defense for London, although no concrete evidence of this has been documented. The M1 gun was used in air defense, from 1944 through the early cold war period when the system was gradually phased out with active duty units,beginning in
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| - A 120 mm M1 anti-aircraft gun at US Army Ordnance Museum.
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| - World War II and Korean War
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| - A gun commander, a gunner with an eight man squad, and an ammunition chief supervising two ammunition handlers - a total of thirteen men.
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| - The 120 mm Gun M1 was the United States Army's standard super-heavy anti-aircraft gun, complementing the smaller and more mobile M2 90 mm gun in service. Its maximum altitude was about , which garnered it the nickname the stratosphere gun. The 120 served primarily in static defensive roles, although it had been designed to be mobile. One battalion, the 513th AAA Gun Battalion, did make it to the Philippines in February 1945, although they never fired their guns in anger. There is also speculation that some 120s arrived in England in early 1945 to provide air defense for London, although no concrete evidence of this has been documented. The M1 gun was used in air defense, from 1944 through the early cold war period when the system was gradually phased out with active duty units,beginning in 1954 when the Nike Ajax surface to air missile gave air defenders a significantly greater long range capability.Cold war Army ARAACOM planning against long range Soviet Tu-4 bomber attack included 44 active duty and 22 National guard battalions divided into seven brigades and 20 anti-aircraft artillery groups as well as two Canadian antiaircraft battalions for the joint defense of the Sault Ste Marie Canal,equipped with the M1 120mm gun,guided by long range Lashup AN/CPS-5 radars for the protection of Nuclear production facilities,major Industrial centers,Strategic Air force bases,and select major population centers.the construction of the Pinetree, Mid-Canada and DEW line, Early Warning Radars which were all completed by 1957, along with Large scale deployment of U.S. and Canadian jet Interceptors Equipped with the AIR-2 Genie Nuclear Air to Air missile,and introduction of the First Soviet ICBM the R7 in 1957,all rendered Heavy AA guns obsolete. remaining National Guard heavy gun units converted to Nike or had been deactivated by January 1960.
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