WThe 20 mm modèle F2 gun is a naval defence weapon used by the French Navy. It was developed from the GIAT M693. It fires the 20×139 mm round originally developed for the Hispano-Suiza HS.820 series.
WSkysweeper was an anti-aircraft gun deployed in the early 1950s by both the U.S. Army and U.S. Air Force. It was the first such gun to combine a gun laying radar, analog computer (director) and an autoloader on a single carriage.
WThe Oerlikon 20 mm cannon is a series of autocannons, based on an original German Becker Type M2 20 mm cannon design that appeared very early in World War I. It was widely produced by Oerlikon Contraves and others, with various models employed by both Allied and Axis forces during World War II, and many versions are still in use today.
WThe Oerlikon GDF or Oerlikon 35 mm twin cannon is a towed anti-aircraft gun made by Oerlikon Contraves. The system was originally designated as 2 ZLA/353 ML but this was later changed to GDF-001. It was developed in the late 1950s and is used by around 30 countries.
WGreen Mace, also known as the QF 127/58 SBT X1, was a British heavy anti-aircraft gun of the 1950s. It used a variety of techniques to improve the firing rate of the gun, and the velocity of its projectiles. Although a prototype was built and survives today, it was rendered obsolete by the development of the guided surface-to-air missile and thus never entered production.
WThe Type 63 and Type 65 are Chinese self-propelled anti-aircraft gun based on the Soviet T-34/76 or T-34/85 medium tank chassis.
WThe ZU-23-2, also known as ZU-23, is a Soviet towed 23 mm anti-aircraft twin-barreled autocannon. ZU stands for Zenitnaya Ustanovka – anti-aircraft mount. The GRAU index is 2A13.