Admiralty
It evolved from *Admiralty Navy War Council, (1909–1912) which in turn became the Admiralty War Staff, (1912–1917) before finally becoming the Admiralty Naval Staff in 1917. It was the former senior command, operational planning, policy and strategy department within the British Admiralty. It was established in 1917 and existed until 1964 when the department of the Admiralty was abolished, and the staff departments function continued within the Navy Department of the Ministry of Defence until 1971 when its functions became part of the new Naval Staff, Navy Department of the Ministry of Defence.
Navy Command (Royal Navy)
Prior to 1964 responsibility for control and direction of the British Naval Affairs lay with Admiralty, naval command lay with the Admiralty Naval Staff. Following the merger of the Admiralty in 1964 into the new Ministry of Defence it became known as the Navy Department. The Royal Navy was historically divided into a number of fleets and ashore commands, prominent examples being the Home Fleet and Portsmouth Command. By the 1960s a system was introduced to change the previous, globally dispersed assets, the fleet system was replaced at first by a Western Fleet and Eastern Fleet. However these were also eventually abolished and their units amalgamated into CINCFLEET. At the same time, the commands established to manage individuals naval bases were replaced in 1969 after the post of Commander-in-Chief, Plymouth was merged with that of Commander-in-Chief, Portsmouth to form Naval Home Command. As overseas bases continued to be reduced, the Navy's shore establishments became more concentrated in the UK, under Naval Home Command.