View source for M42 Duster

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{{Infobox Weapon
|name=M42 Duster
|image=[[Image:M42-Duster-latrun-1.jpg|300px]]
|caption=M42 in Yad la-Shiryon museum, Israel.
|origin={{USA}}
|type=[[Self-propelled anti-aircraft weapon|Self-propelled anti-aircraft gun]]
|is_vehicle=yes
|length=5.82 m
|width=3.23 m
|height=2.85 m
|weight=24.8 t (loaded)
|speed=72 km/h
|vehicle_range=160 km
|suspension=[[torsion beam suspension|torsion bar]]
|engine=6-[[cylinder (engine)|cylinder]] [[air-cooled engine|air cooled]] [[gasoline engine|gasoline]]
|engine_power=500 hp (375 kW)
|pw_ratio=22.2 hp/t
|crew=4–6
|primary_armament=[[Bofors 40 mm gun|M2A1 40 mm]] twin anti-aircraft gun
|secondary_armament=1 x [[Browning Model 1919 machine gun|M1919A4 7.62 mm machine gun]]
|armour=9–25 mm
}}
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[[Image:Talbot County (LST-1153).jpg|thumb|right|300px|[[USS Talbot County (LST-1153)|USS ''Talbot County'' (LST-1153)]] offloads M42 Dusters of the 517th Artillery at the [[Rio Hato]] training area in [[Panama]] during 1965 war games.]]
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The '''M42 40&nbsp;mm Self-Propelled Anti-Aircraft Gun''', or "Duster" as it is known, is an armored light air-defense gun built for the [[U.S. Army]] from [[1952]] until December [[1959]]. Production of this vehicle was performed by the tank division of the [[General Motors Corporation]]. It used components from the [[M41 Walker Bulldog|M41]] light tank and was constructed of all welded steel.  The 500 hp, six cylinder, air-cooled, gasoline engine is located in the rear of the vehicle. A total of 3,700 M42s were built.  The vehicle has a crew of six and weighs 22,500&nbsp;kg (49,500 lb) fully loaded.  Maximum speed is 45 mph with a range of 100 miles.  Armament consists of fully automatic twin 40&nbsp;mm M2A1 [[Bofors 40 mm gun|Bofors]], with a rate of fire of 240 rounds per minute (rpm) and either a .30 cal. [[M1919 Browning machine gun|Browning M1919A4]] or M-60 Machine Gun.

Although the M42 Duster was initially designed in the anti-aircraft role, it found great success when used in the [[Vietnam War]] against unarmored ground forces.  

==Development==

During the course of the [[Korean War]], the U.S. Army decided to phase out all vehicles based on the [[M24 Chaffee]] chassis, such as the M19 Gun Motor Carriage 40mm Anti-Aircraft, in favor of designs that utilized the chassis of the M41.  Since the 40mm guns were still seen as an effective anti-aircraft weapon, the turret of the M19 was simply mounted to the M41 chassis with few changes except a partial redesign to accommodate the larger turret ring of the M41 and designated as the M42.  Initially, aiming the 40mm guns assisted by a [[radar]] [[fire control system]] housed in a secondary vehicle of similar design but this idea was scrapped as development costs mounted.

==Service history==

Production of the M42 began in early 1952 at GM's Cleveland Tank Plant.  It entered service in 1953 and replaced a variety of different anti-aircraft systems in armored divisions.  In 1956, the M42 received a new engine and other upgrades along with other M41 based vehicles, becoming the M42A1.  Production was halted in Dec. 1959 with 3700 examples made during its production run. Sometime in the late 50s, the U.S. Army reached the conclusion that anti-aircraft guns were no longer viable in the jet age and began fielding a self propelled version of the [[MIM-23 HAWK|HAWK]] SAM instead.  Accordingly, the M42 was retired from front line service and passed to the National Guard with the last M42s leaving the regular Army by 1963.

===Vietnam War===

Unfortunately, the HAWK missile system performed poorly in low altitude defense. To ensure some low altitude anti-aircraft capability for the ever increasing amount of forces fielded in [[Vietnam]], the Army began recalling M42A1s back into active service and organizing them into [[air defense artillery]] (ADA) battalions.  Three M42A1 equipped ADA battalions were sent to Vietnam, the first arriving in late 1966.

[[Image:MACV Compound Duster Post-Tet Feb., 1968.jpg|thumb|400px|left|M 42 Duster, MACV compound at Quang Tri City, February 1968.]]Despite a few air kills early, the air threat posed by [[North Vietnam]] never materialized, and ADA crews found themselves increasingly involved in ground support missions.  Most often the M42 was on point security, convoy escort or perimeter defense.  The "Duster" (as it was called by U.S. troops in Vietnam) was soon found to excel in ground support.  The rapid firing 40mm guns could devastate massed infantry attacks or sweep away [[guerrillas]] hiding in the [[jungle]] with equal ease.

===Post Vietnam===
[[Image:Bundesarchiv B 145 Bild-F005978-0003, Manöver Heer, Flak-Panzer M-42.jpg|thumb|right||M42 used by German [[Bundeswehr]]]]
The last M42A1 equipped ADA units left Vietnam in 1972 and the Duster was returned to the National Guard.  The U.S. Army  maintained multiple National Guard M42 battalions as a corps level ADA asset until the system was retired in 1988.


== Operators ==
*{{flag|United States of America}} - [[US Army]], [[US National Guard]]
*{{flag|Germany}}
*{{flag|Greece}} - [[Hellenic Army]], from surplus German stocks.
*{{flag|Japan}}-[[Japan Ground Self Defense Force]]
*{{flag|Taiwan}}
*{{flag|Turkey}} - Will be replaced by a new FNSS 2x35mm ACV
*{{flag|Lebanon}} - [[Lebanese Army]], passed on to the [[Lebanese Arab Army]], [[Tigers Militia (Lebanon)]], [[Lebanese Forces]]
*{{flag|Jordan}}
*{{flag|Venezuela}} - [[Venezuelan Army]], retired from service in 1989, AMX-13/M41E1 Ráfaga since 1998

==Variants==
*'''M42A1''': received the AOSI-895-5 engine (500 hp).
*'''Type 64''': Taiwanese light tank variant produced by combining turrets of decommissioned M18 tank destroyers with surplus M42 hulls.  Compartments over the track guards for spare Bofors gun barrels were replaced with storage boxes of the stock M41 tank.  One battalion worth (50+) of conversions were made.
*'''AMX-13/M41E1 Ráfaga ''': Venezuelan Self-propelled AA gun variant produced by combining turrets of decommissioned M-42A1 Dusters towers (M41E1) with surplus AMX-13M51 hulls. With improvements in fire control for night operations and on original chassis. One AA-Battery +/-10 of conversions were made).

==References==
* SNL G253

==See also==
* [[ZSU-57-2]] - Comparable Soviet self-propelled AA gun 
* [[Type 63 anti-aircraft gun|Type 63]]
* [[G-numbers]]


==External links==
{{Commons|M42 Duster}}
* [http://afvdb.50megs.com/usa/m42duster.html AFV Database]
* [http://www.ndqsa.com/duster.html]
* [http://svsm.org/gallery/M42 Photo gallery at svsm.org]
* [http://www.517thartillery.org M-42 Dusters in active service with the 4/517th artillery Panama Canal Zone]

[[Category:Armored fighting vehicles of the United States]]
[[Category:Self-propelled anti-aircraft weapons]]
[[Category:40 mm artillery]]

[[Category:2Fix]]