M56 Scorpion
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The M56 "Scorpion" self-propelled gun is an American unarmored,
airmobile Air assault is the movement of ground-based military forces by vertical take-off and landing (VTOL) aircraft, such as helicopters, to seize and hold key terrain that has not been fully secured, and to directly engage enemy forces behind enemy ...
self-propelled
tank destroyer A tank destroyer, tank hunter or tank killer is a type of armoured fighting vehicle, predominantly intended for anti-tank duties. They are typically armed with a direct fire anti-tank gun, artillery gun, also known as a self-propelled anti-ta ...
, which was armed with a 90 mm M54 gun with a simple blast shield, and an unprotected crew compartment.


History

The M56 was manufactured from 1953 to 1959 by the
Cadillac Cadillac Motor Car Division, or simply Cadillac (), is the luxury vehicle division (business), division of the American automobile manufacturer General Motors (GM). Its major markets are the United States, Canada and China; Cadillac models are ...
Motor Car Division of
General Motors General Motors Company (GM) is an American Multinational corporation, multinational Automotive industry, automotive manufacturing company headquartered in Detroit, Michigan, United States. The company is most known for owning and manufacturing f ...
for use by US
airborne forces Airborne forces are ground combat units carried by aircraft and airdropped into battle zones, typically by parachute drop. Parachute-qualified infantry and support personnel serving in airborne units are also known as paratroopers. The main ...
, though the vehicle was eventually used by the
Spanish Navy Marines The Marine Infantry () are the marines of the Spanish Navy. Responsible for conducting amphibious warfare. Fully integrated into the Spanish Navy's structure, the branch's history dates back to 1537 when Charles V, Holy Roman Emperor formed the ...
,
Morocco Morocco, officially the Kingdom of Morocco, is a country in the Maghreb region of North Africa. It has coastlines on the Mediterranean Sea to the north and the Atlantic Ocean to the west, and has land borders with Algeria to Algeria–Morocc ...
and
South Korea South Korea, officially the Republic of Korea (ROK), is a country in East Asia. It constitutes the southern half of the Korea, Korean Peninsula and borders North Korea along the Korean Demilitarized Zone, with the Yellow Sea to the west and t ...
. With a crew of four (commander, gunner, loader and driver), the M56 weighed empty and combat-loaded. It had
infrared Infrared (IR; sometimes called infrared light) is electromagnetic radiation (EMR) with wavelengths longer than that of visible light but shorter than microwaves. The infrared spectral band begins with the waves that are just longer than those ...
driving lights but no
NBC protection Chemical, biological, radiological, and nuclear defense (CBRN defense) or Nuclear, biological, and chemical protection (NBC protection) is a class of protective measures taken in situations where chemical, biological, radiological, or nuclea ...
and was not
amphibious Amphibious means able to use either land or water. In particular it may refer to: Animals * Amphibian, a vertebrate animal of the class Amphibia (many of which live on land and breed in water) * Amphibious caterpillar * Amphibious fish, a fish ...
. The M56 was a fully tracked vehicle with rubber-tired run-flat road wheels and front drive
sprocket A sprocket, sprocket-wheel or chainwheel is a profiled wheel A wheel is a rotating component (typically circular in shape) that is intended to turn on an axle Bearing (mechanical), bearing. The wheel is one of the key components of the whe ...
wheels. It was powered by a
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AOI-403-5
gasoline Gasoline ( North American English) or petrol ( Commonwealth English) is a petrochemical product characterized as a transparent, yellowish, and flammable liquid normally used as a fuel for spark-ignited internal combustion engines. When for ...
engine An engine or motor is a machine designed to convert one or more forms of energy into mechanical energy. Available energy sources include potential energy (e.g. energy of the Earth's gravitational field as exploited in hydroelectric power ge ...
developing at 3,000 rpm, allowing a maximum road speed of and a maximum range of . Twenty-nine rounds of main gun ammunition were carried, and only the small 5 mm thick blast shield was armored.


In service

The M56 saw combat service with U.S. forces in the
Vietnam War The Vietnam War (1 November 1955 – 30 April 1975) was an armed conflict in Vietnam, Laos, and Cambodia fought between North Vietnam (Democratic Republic of Vietnam) and South Vietnam (Republic of Vietnam) and their allies. North Vietnam w ...
. It was deployed with the
173rd Airborne Brigade The 173rd Airborne Brigade ("Sky Soldiers") is an Airborne forces, airborne infantry brigade combat team (IBCT) of the United States Army based in Vicenza, Italy. It is the United States European Command's conventional airborne strategic respo ...
, which was the only Airborne Brigade deployed with the M56, where it was used mainly in direct fire-support. Its function as an air-mobile, self-propelled, anti-tank vehicle was eventually replaced in Vietnam by the troubled but effective
M551 Sheridan The M551 "Sheridan" AR/AAV (Reconnaissance vehicle, Armored Reconnaissance/Airborne Assault Vehicle) was a light tank developed by the United States and named after General (United States), General Philip Sheridan, of American Civil War fame. It ...
which had a fully armored turret. The USMC used the
M50 Ontos Ontos, officially the Rifle, Multiple 106 mm, Self-propelled, M50, was an American light armored tracked anti-tank vehicle developed in the 1950s. It mounted six 106 mm manually loaded M40 recoilless rifles as its main armament, which c ...
, which had an armored cabin and was armed with recoilless rifles, in a similar role (the running gear of the first Ontos prototype was the same as on the M56, but it was replaced for the production variant). As for foreign operators, Morocco was the only export customer which used M56 Scorpions in combat. M56 Scorpions were deployed against Polisario rebels during the
Western Sahara War The Western Sahara War (, , ) was an armed conflict between the Sahrawi indigenous Polisario Front and Morocco from 1975 to 1991 (and Mauritania from 1975 to 1979), being the most significant phase of the Western Sahara conflict. The confl ...
. A number of examples were made available to South Korea but not used.


Operators


Former operators

* * : 5 exported in 1965. Used by Tercio de Armada from 1966 to 1970 * : 1 for evaluation in 1960 * : 87 received in 1966-1967 * : 60 ex-American M56 were left as surplus but never used


Survivors

United States *
American Legion The American Legion, commonly known as the Legion, is an Voluntary association, organization of United States, U.S. war veterans headquartered in Indianapolis, Indiana. It comprises U.S. state, state, Territories of the United States, U.S. terr ...
Post 8 in Guntersville, Alabama. * Two of them can be found in
The American Military Museum The American Military Museum (also known as Tankland) is a privately owned museum in South El Monte, California, USA. It is dedicated to tanks, armoured vehicles and artillery from the Second World War and post war periods and contains over 180 ...
in South El Monte, California. * American Legion post in Duluth, Georgia. * Ropkey Armor Museum in Crawfordsville, Indiana * Veterans Memorial Stadium in Cedar Rapids, Iowa. * Iowa Gold Star Museum at Camp Dodge in Johnston, Iowa. *
Combat Air Museum The Combat Air Museum is a non-profit aviation museum at Topeka Regional Airport in Topeka, Kansas, United States. The museum is dedicated to the education of the local and regional communities by collecting, preserving, and exhibiting U.S. mili ...
at the former
Forbes Field Forbes Field was a baseball park in the Oakland (Pittsburgh), Oakland neighborhood of Pittsburgh, Pennsylvania, from 1909 to June 28, 1970. It was the third home of the Pittsburgh Pirates, the city's Major League Baseball (MLB) team, and the fir ...
, in Topeka, Kansas. * Forest Hill Station in Millersburg, Kentucky. * Boyd County War Memorial in Armco Park in Summit, Kentucky. * Constitution Park,
Cumberland, Maryland Cumberland is a city in Allegany County, Maryland, United States, and its county seat. At the 2020 United States census, 2020 census, the city had a population of 19,075. Located on the Potomac River, Cumberland is a regional business and comm ...
. *
Collings Foundation The Collings Foundation is a private non-profit educational foundation located in Stow, Massachusetts, with a mission dedicated to the preservation and public display of transportation-related history, namely automobile and aviation history. The ...
in Stow, Massachusetts. * Mississippi Armed Forces Museum,
Camp Shelby Camp Shelby is a U.S. Army post whose south gate is located at the southern boundary of Hattiesburg, Mississippi, along U.S. Highway 49. It was originally established during World War I, and has served almost continuously since then as a trai ...
, Mississippi. * Disabled American Veterans Belleville Hall,
Belleville, New Jersey Belleville (French: "Belle ville" meaning "beautiful town") is a township in Essex County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 38,222. an increase of 2,296 (+6.4%) from the 2010 ...
. * Elmwood Park,
New Jersey New Jersey is a U.S. state, state located in both the Mid-Atlantic States, Mid-Atlantic and Northeastern United States, Northeastern regions of the United States. Located at the geographic hub of the urban area, heavily urbanized Northeas ...
. * 82nd Airborne War Memorial Museum in
Fort Bragg Fort Bragg (formerly Fort Liberty from 2023–2025) is a United States Army, U.S. Army Military base, military installation located in North Carolina. It ranks among the largest military bases in the world by population, with more than 52,000 m ...
, North Carolina. *
Fort Sill Fort Sill is a United States Army post north of Lawton, Oklahoma, about 85 miles (137 km) southwest of Oklahoma City. It covers almost . The fort was first built during the Indian Wars. It is designated as a National Historic Landmark a ...
, Oklahoma * 45th Infantry Museum in Oklahoma City, Oklahoma. * Corner of Elk St. and 3rd St.,
Elkton, South Dakota Elkton is a city in Brookings County, South Dakota, United States. The population was 755 at the 2020 census. Some of Elkton's population also have Minnesota addresses since the city is located so close to the state line. History Elkton was pl ...
* American Legion Hall, Post 88, in Donelson, Tennessee. * Texas Military Forces Museum,
Camp Mabry Camp Mabry (ICAO: KATT) is a military installation in Austin, Texas, housing the headquarters of the Texas Military Department, Texas Military Forces, and Texas Military Forces Museum. Established in 1892, Camp Mabry is the third-oldest active ...
in Austin, Texas. *
Veterans of Foreign Wars The Veterans of Foreign Wars (VFW), formally the Veterans of Foreign Wars of the United States, is an Voluntary association, organization of United States Armed Forces, United States war veterans who fought in wars, Military campaign, campaig ...
Post 2524 Culpeper, Virginia. * American Armored Foundation Tank Museum in Danville,
Virginia Virginia, officially the Commonwealth of Virginia, is a U.S. state, state in the Southeastern United States, Southeastern and Mid-Atlantic (United States), Mid-Atlantic regions of the United States between the East Coast of the United States ...
, along with a diorama of a destroyed M56. *
Auburn, Washington Auburn is a city in King County, Washington, King County, Washington (state), Washington, United States (with a small portion crossing into neighboring Pierce County, Washington, Pierce County). The population was 87,256 at the 2020 United States ...
. * Tillicum Park in
Forks, Washington Forks, also previously known as the unincorporated town of Quillayute, is a town in southwest Clallam County, Washington, Clallam County, Washington (state), Washington, United States. The population was 3,335 at the 2020 United States Census, 2 ...
. South Korea * One former
Republic of Korea Army The Republic of Korea Army (ROKA; ), also known as the ROK Army or South Korean Army, is the army of South Korea, responsible for ground-based warfare. It is the largest of the military branches of the Republic of Korea Armed Forces with 365,0 ...
example on display at the
War Memorial of Korea The War Memorial of Korea () is a museum located in Yongsan-dong, Yongsan-gu, Seoul, South Korea. It opened in 1994 on the former site of the army headquarters to exhibit and memorialize the military history of Korea. It was built for the purp ...
. New Zealand * One example in M&M Military Vehicle Museum (Private Museum) under restoration.


See also

*
G-numbers This is the Group G series List of the United States military vehicles by (Ordnance) supply catalog designation, – ''one'' of the alpha-numeric "standard nomenclature lists" (SNL) that were part of the overall list of the United States Army ...
(SNL G289) *
M-numbers The following is a (partial) listing of vehicle model numbers or M-numbers assigned by the United States Army. Some of these designations are also used by other agencies, services, and nationalities, although these various end users usually assig ...
* FV4401 Contentious


Footnotes


Bibliography

* *


Further reading

* *


External links


90 mm Self-propelled Gun M56 Scorpion

American Armored Foundation Tank Museum Website
{{Use dmy dates, date=June 2017 Cold War armored fighting vehicles of the United States Tank destroyers of the United States Airborne fighting vehicles Military vehicles introduced in the 1950s