The 121st Anti-aircraft Artillery Regiment "Ravenna" is an air defense regiment of the Italian Army. Originally a field artillery regiment of the Royal Italian Army, the regiment was assigned in World War II to the 3rd Infantry Division "Ravenna", with which the regiment deployed to the Eastern Front, where division and regiment were destroyed during the Red Army's Operation Little Saturn. In 1951, the Italian Army reformed the regiment and, on 15 June 1953, the regiment was transferred from the field artillery to the anti-aircraft specialty. Today the regiment is based in Bologna in the Emilia-Romagna and assigned to the Anti-aircraft Artillery Command. The regiment's batteries are equipped with Skyguard surface-to-air missile systems respectively Stinger man-portable air-defense systems. The regiment's anniversary falls, as for all Italian Army artillery regiments, on June 15, the beginning of the Second Battle of the Piave River in 1918.