ZSU-23-4 Shilka

self-propelled anti-aircraft gun system
English: The ZSU-23-4 "Shilka" is a lightly armoured, self-propelled, radar guided anti-aircraft weapon system on PT-76 tank chassis. ZSU stands for Zenitnaya Samokhodnaya Ustanovka, "anti-aircraft self-propelled system". It is named after the Russian Shilka River.