Conscription of men into the Armed Forces continued "ad hoc" from 1945 until the National Service Act 1948 established a system from 1 January 1949 of calling up men in Britain reaching the age of 18 for eighteen months full-time service followed by four years reserve service. In 1950, as a result of the Korean War, full-time service was increased to two years, and reserve service reduced to three and a half years. In 1957, phasing-out of the system was announced, the last men being called up in 1960, and the last conscript being discharged in May 1963, after allowance for deferment of service.