On 15 September 1939, Menzies announced the formation of the Second AIF, an expeditionary force of 20,000, to consist of one infantry division and any auxiliary units that the Australian Army could fit into it. On 15 November 1939, Menzies announced the reintroduction of conscription for home defence service effective 1 January 1940. Unmarried men turning 21 in the year ending 30 June 1940 would be drafted into the Militia.