The Australian Army was the largest service in the Australian military during World War II. Prior to the outbreak of war the Australian Army was split into the small full-time Permanent Military Forces (PMF) and the larger part-time Militia. Following the outbreak of war, on 14 September 1939 Prime Minister Robert Menzies announced that 40,000 members of the Militia would be called up for training and a 20,000-strong expeditionary force, designated the Second Australian Imperial Force (Second AIF), would be formed for overseas service. Meanwhile, conscription was introduced in October 1939 to keep the Militia at strength as its members volunteered for the AIF. The Australian Army subsequently made an important contribution to the Allied campaigns in the Mediterranean, the Middle East and N