The 240-mm self-propelled mortar known to the West as the M-1975 is known as the SM-240 (2S4) by the former Soviet Army, although its more common name is the Tyulpan, or Tulip Tree. The M-1975 consists of a much modified GMZ tracked minelaying vehicle carrying a 240-mm M-240 breech-loading mortar on the hull rear.