2S4 Tyulpan
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The 2S4 Tyulpan is a Soviet 240 mm self-propelled heavy mortar. "2S4" is its GRAU designation. The Tyulpan is the largest mortar system in use today. Wikipedia
Armor: 20 mm (0.79 in)
Crew: 5
Engine: V59 V-12 liquid-cooled diesel; 388 kW (520 hp)
Height: 3.2 m (10 ft 6 in)
In service: 1972–present
Main armament: 240 mm (9.4 in) mortar
Mass: 30 t (30 long tons; 33 short tons)