SO-152 (СО-152) is a Soviet 152.4 mm self-propelled gun developed in 1968.

The SO-152 (Russian: СО-152) is a Soviet 152.4 mm self-propelled gun developed in 1968, as a response to the American 155 mm M109 howitzer. Development began in 1967, according to the Resolution of the Council of Ministers of the Soviet Union from July 4, 1967. In 1968, the SO-152 was completed and in 1971 entered service. Its GRAU designation is 2S3 (2С3). The fighting vehicle also received the added designation Akatsiya (Акация), which is Russian for Acacia.

The Akatsiya is armed with a 152.4 mm howitzer based on the Soviet 152.4 mm D-20 howitzer. The artillery system was developed at the design bureau No. 9 of Sverdlovsk. The factory designation of the howitzer is D-22 and the GRAU designation, 2A33. The chassis was developed by Uraltransmash.

The driver’s and engine-transmission compartments are located in the front part of a hull, the fighting compartment with rotatory turret in middle and rear parts of the hull. The armor is welded rolled steel. The SPG is equipped with an R-123 radio set, an R-124 intercom, an automatic CBRN defense system with filtration unit and fire-fighting equipment. The V-59 12-cylinder four-stroke water-cooled diesel engine connects to a mechanical two-speed transmission. The gear box is combined into one block with a planetary steering gear. The 2S3 has self-entrenching equipment which allows it to prepare a trench within 20–40 min.

The crew consists of 4–6 men: a driver, a gunner, a loader, a commander, and two ammunition bearers, which are positioned to the rear of the vehicle feeding rounds through two hatches in the hull rear when in masked firing position.

Designated M1973 by the U.S. Army

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