From 1946 to 1964 five Departments of State did the work of the modern Ministry of Defence: the Admiralty, the War Office, the Air Ministry, the Ministry of Aviation, and an earlier form of the Ministry of Defence. These departments merged in 1964; the defence functions of the Ministry of Aviation Supply merged into the Ministry of Defence in 1971.
During what years did the five Departments of State do the work of the modern Ministry of Defence? What were the five Departments of State that did the work of the modern Ministry of Defence? When did the defence functions of the Ministry of Aviation Supply merge into the Ministry of Defence? All former Departments of State (except the Ministry of Aviation Supply) merged in what year?