122mm D-74 Towed Field Gun
First combat actions for the Soviet-era D-74 122mm field gun were in the long-running Vietnam War.
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Even before the final shots of World War 2 (1939-1945) were ever fired, the Soviet Army cast its eye towards the future 'Cold War' and began several projects to modernize its war-making capabilities. In the immediate post-war world, there arose two new designs of field guns, one in 122mm caliber flavor and the other in 130mm caliber flavor. The former was designated as the "D-74" and the later became the storied "M-46".
Production of the D-74 began in 1955 and the product was publically unveiled that same year. Its design was attributed to F.F. Petrov who lent his wide-reaching wartime expertise to the project. In time, the D-74 was standardized in the Soviet ranks and went on to see adoption by other fighting forces of the world loyal to the Soviet Union at the time - these to include Cambodia, Angola, China, Sri Lanka, Pakistan, Iran, Egypt, Syria, North Korea and Zimbabwe.
At its core, the weapon was a traditionally-arranged artillery piece comprised of a two-wheeled, rubber-tired carriage unit (the unit also shared with the D-20 gun series of 152mm caliber), mounting hardware containing the elevation and traverse functions, and the gun tube itself. A horizontal sliding wedge was used at the gun breech to access the chamber. Elevation was limited to +45/-5 degrees and traversal was 45-degrees from centerline. An optional thin gun shield offered limited protection to the gunnery crew that numbered between seven and nine men.