The Fiat 3000s that were first upgraded and officially designated as the carro d'assalto Fiat 3000, Mod. 21. or Carro Armato L5/21 and the later upgrade the up-gunned version of the 3000, armed with a 37/40 gun, was tested in 1929 and was officially adopted in 1930 with the designation of carro d'assalto Fiat 3000, Mod. 30 or L5/30 light tank still were in use when World War II started. With Italy's entry into World War II in June 1940, a limited number of Fiat 3000s still in service with the Italian Army were employed operationally on the Greek-Albanian front. They were also among the last Italian tanks to oppose the Allies, as in July 1943, when the Allies landed in Sicily, two Italian tank companies on the island were still equipped with the 3000. One company was dug in and their vehicles were used as fixed fortifications, while the other company was used in a mobile role at the Amphibious Battle of Gela, with few of the tanks surviving the Allied drive.