The Oerlikon 20 mm is a Swiss-made autocannon designed for anti-aircraft and anti-vehicle use. Developed in the 1930s, it fires 20 mm rounds at a high rate, making it effective against low-flying aircraft and light armored vehicles. Its compact size allows for easy mounting on various platforms, including ships, vehicles, and aircraft. This weapon system has been widely used by many countries and has seen action in numerous conflicts. The Oerlikon 20 mm is known for its reliability and versatility, contributing to its long-standing presence in military arsenals around the world.