In 1956 the gun was standardized as the M61 20mm cannon and entered service with both the United States Army and Air Force. With the introduction of helicopters to the modern battlefield ...

The M61 is found on many US fighter jets, from the long-retired Convair F-106 Delta Dart and the F-111 Aardvark to the F-14 ...

In recent days, the IDF has placed the first Vulcan cannon on the ... that fires 20 mm × 102 mm rounds at an extremely high rate (6,000 rounds per minute). The M61 and its family of derivatives ...