The 2S1 Gvozdika is a Soviet self-propelled howitzer introduced in 1972 and is in service in Russia and other countries as of 2025. It is based on the MT-LBu multi-purpose chassis, mounting a 122 mm 2A18 howitzer. "2S1" is its GRAU designation. An alternative Russian designation is SAU-122, but in the Russian Army it is commonly known as Gvozdika. The 2S1 is fully amphibious with very little preparation, and once afloat is propelled by its tracks. A variety of track widths are available to allow the 2S1 to operate in snow or swamp conditions. It is NBC protected and has infrared night-vision capability.
The 2S1 was developed in Kharkiv, Ukrainian Soviet Socialist Republic. It has seven road wheels on each side; the running gear can be fitted with different widths of track to match terrain. From Wikipedia
