The Lockheed Ventura is a twin-engine medium bomber and patrol bomber of World War II. The Ventura first entered combat in Europe as a bomber with the RAF in late 1942. Designated PV-1 by the United States Navy (US Navy), it entered combat in 1943 in the Pacific. The bomber was also used by the United States Army Air Forces (USAAF), which designated it the Lockheed B-34 (Lexington) and B-37 as a trainer. British Commonwealth forces also used it in several guises, including antishipping and antisubmarine search and attack. The Ventura was developed from the Lockheed Model 18 Lodestar transport, as a replacement for the Lockheed Hudson bombers then in service with the Royal Air Force. Used in daylight attacks against occupied Europe, they proved to have weaknesses and were removed from bomber duty and some used for patrols by Coastal Command. After USAAF monopolization of land-based bombers was removed, the US Navy ordered a revised design which entered service as the PV-2 Harpoon for anti-submarine work. Royal Australian Air Force In the United Kingdom, No. 464 Squadron RAAF formed (mixure of Commonwealth personnel) at RAF Feltwell in September 1942 to operate the Ventura as part of 2 Group, Bomber Command; it converted to the de Havilland Mosquito in September 1943. In the Mediterranean, No. 459 Squadron RAAF was equipped with the Ventura V between December 1943 to July 1944, flying mainly anti-submarine and anti-shipping patrols. In Australia, 55 PV-1s were supplied to the RAAF for use in the South West Pacific Area. No. 13 Squadron RAAF was the only operational squadron in Australia equipped with the Ventura. It operated primarily in north-eastern Queensland and then the Northern Territory, and later serving in the Borneo campaign of 1945. After the war, the squadron used its aircraft to help transport liberated prisoners of war. For details of the various versions and other operational history of the Ventura, click here.