ZU 23-2 AA gun firing.
Hellenic Army National Guard A/A guns ZU 23-2 in a live fire military exercise.
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The ZU-23-2, also known as ZU-23, is a Soviet towed 23x152 mm anti-aircraft twin-barreled autocannon. ZU stands for Zenitnaya Ustanovka (Russian: Зенитная Установка) - anti aircraft mount.