The gun was commonly used as a close-in anti-aircraft weapon on Royal Navy and Allied ships, typically in a four-gun mounting (UK) or two-gun mounting (Dutch), as well as tanks and other armoured fighting vehicles.The Mark II entered service in 1933 and was mounted in some British light tanks, often paired with a 0.303 Vickers.[1] Marks IV and V were improved versions and were also used on trucks in the North Africa Campaign such as by Long Range Desert Group It was superseded for use in British-built armoured fighting vehicles during the Second World War by the 15 mm (0.59 in) Besa machine gun, a Czech design adopted by the British for the Royal Armoured Corps.The Mark III was a naval version used as an anti-aircraft weapon, mostly by the Royal Navy and allied navies in the Second World War, typically in mountings of four guns but also as single and dual mounts.It proved insufficiently powerful at short-range against modern all-metal aircraft and was superseded during the Second World War by the Oerlikon 20 mm cannon.