The Mitsubishi A6M "Zero" was a long range carrier-based fighter aircraft formerly manufactured by Mitsubishi Aircraft Company, a part of Mitsubishi Heavy Industries, and operated by the Imperial Japanese Navy from 1940 to 1945. The A6M was designated as the Mitsubishi Navy Type 0 carrier fighter (???????, rei-shiki-kanjo-sentoki), or the Mitsubishi A6M Rei-sen. The A6M was usually referred to by its pilots as the Reisen (??, zero fighter), "0" being the last digit of the imperial year 2600 (1940) when it entered service with the Imperial Navy. The official Allied reporting name was "Zeke", although the name "Zero" (from Type 0) was used colloquially by the Allies as well.