High Quality Content by WIKIPEDIA articles! The Stridsvagn 103 (Strv 103), or S-Tank ("Stridsvagn" being the Swedish word for Tank, literally "fighting carriage"), was a Swedish post-war main battle tank. It was known for its unconventional turret-less design, with a fixed gun traversed by engaging the tracks and elevated by adjusting the hull suspension. The S-Tank was developed in the 1950s and was the first main battle tank to use a turbine engine. The result was a very low-profile design with an emphasis on defense and heightened crew protection level. S-Tanks formed a major portion of the Swedish armored forces from the 1960s to part of the 1990s, but have since been removed from service in favour of the Leopard 2.