The Bofors 40mm gun is an anti-aircraft/multi purpose auto cannon designed and manufactured in the 1930s by the Swedish arms manufacturer A B Bofors. It was introduced in 1934 and is still being used today, making it the longest serving artillery piece of all times. During its long life, it has been used by worldwide armies in a long list of conflicts, notably WWII during which time it was used by most of the western Allies as well as by the Axis powers. It also saw service in the Falklands War of 1982. Shown here in olive drab.