A number of examples were made available to South Korea but not used. M56 Scorpions were deployed against Polisario rebels during the Western Sahara War. The USMC used the Ontos, 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).Īs for foreign operators, Morocco was the only export customer which used M56 Scorpions in actual combat. Its function as an air-mobile, self-propelled, anti-tank vehicle was eventually replaced in Vietnam by the troubled but effective M551 Sheridan which had a fully armored turret. It was deployed with the 173rd Airborne Brigade, which was the only Airborne Brigade deployed with the M56, where it was used mainly in a direct fire-support role. M56 Scorpion of 16th Armor, US 173rd Airborne Brigade firing at Viet Cong during Operation Toledo 17 June 1966 Twenty-nine rounds of main gun ammunition were carried, and only the small 5 mm thick blast shield was armored. It was powered by a Continental A01-403-5 gasoline engine developing 200 brake horsepower (150 kW) at 3,000 rpm, allowing a maximum road speed of 28 miles per hour (45 km/h) and a maximum range of 140 miles (230 km). The M56 was a fully tracked vehicle with rubber-tired run-flat road wheels and front drive sprocket wheels. ![]() It had infrared driving lights but no NBC protection and was not amphibious. With a crew of four (commander, gunner, loader and driver), the M56 weighed 6.4 tonnes (14,000 lb) empty and 7.7 tonnes (17,000 lb) combat-loaded. The M56 was manufactured from 1953 to 1959 by the Cadillac Motor Car Division of General Motors for use by US airborne forces, though the vehicle was eventually used by the Spanish Navy Marines, Morocco and South Korea. ![]() The M56 "Scorpion" Self-Propelled Gun is an American unarmored, airmobile self-propelled tank destroyer, which was armed with a 90mm M54 gun with a simple blast shield, and an unprotected crew compartment.
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