Centurion Mk.3 - was the primary British main battle tank of the post-World War II period. It is widely considered to be one of the most successful post-war tank designs, remaining in production into the 1960s, and seeing combat in the front lines into the 1980s. The chassis was also adapted for several other roles, and these have remained in service to this day. Development of the tank began in 1943 and manufacture of the Centurion began in January 1945. It first entered combat with the British Army in the Korean War in 1950, in support of the UN forces. The Centurion later served in the Indo-Pakistani War of 1965, it served with the Royal Australian Armoured Corps in Vietnam. Israel used Centurions in the 1967 Six Day War, 1973 Yom Kippur War, and during the 1978 and 1982 invasions of Lebanon. Centurions modified as APC were used in Gaza, the West Bank and on the Lebanese border. It became one of the most widely used tank designs, equipping armies around the world, with some still in service until the 1990s. Between 1946 and 1962, 4,423 Centurions were produced, consisting of 13 basic marks and numerous variants. In British Army use it was replaced by the Chieftain.