In 1910, the universal training scheme was introduced. Under the scheme, all medically fit males 14–20 years of age had to serve in cadets. Boys who did not comply were charged and dealt with by the courts. Training cadets were divided into two groups. Senior cadets aged between 16 and 18 years of age were attached to Militia Units (now known as Army Reserve Units), called Regimental Detachments, while students aged between 14 and 16 years of age remained as school cadets. Officers came from teaching staff and selected cadets were made "Cadet Lieutenants". In 1939, the outbreak of World War II caused the Regimental Detachments to be disbanded as staff were needed to train soldiers for overseas service. Some School Based Units closed down while some struggled on. By the end of World War II, Regimental Detachments had been re-raised. Between 1949 and 1975, School Based Units were attached to Citizen Military Forces units. The CMF is the precursor of the modern day Australian Army Reserve. Regimental Units continued to exist. By 1951, The Commonwealth Cadet Corps was renamed the Australian Cadet Corps (ACC) and on 2 June 1953, The Duke of Edinburgh became the Colonel-in-Chief of the ACC, as a part of the coronation of his wife, Queen Elizabeth II. The Duke of Edinburgh presented his banner as a gift to the Corps on 2 May 1970 at Victoria Barracks, Sydney. At this time, there were 46,000 cadets in Australia.