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.
Department of the Permanent Secretary (Royal Navy)
The Admiralty Secretariat was the organisation staffed by civilian members of the Admiralty initially charged initially with assisting the First Lord of the Admiralty, until the creation of the office of Secretary to the Admiralty and Second Secretary to the Admiralty in the execution of their responsibilities. The structure of secretariat was divided into various branches one responsible for each member of the Board of Admiralty. they included a Civil Branch (‘C Branch’) liaised with the Treasury on matters relating to finance, the Legal Branch or (‘L Branch’) to deal with Justice Department and Admiralty Court's system, the Military Branch or (‘M Branch’), liaises with First Sea Lord's, office dealt with the fleet; the Naval Branch or (‘N Branch’), liaises with Second Naval Lord’s, dealt with personnel. The Ships Branch (‘s Branch’), liaises with the Surveyor of the Navy later Controller of the Navy dealt with procurement. The secretariat is conducted under the direct personal orders of the Board, and the branches were administered until 1907 by a Principal Clerk later called (Assistant Secretary's) except the Civil Branch, which is in charge of the Secretary himself. The Secretariat existed from as early as 1693 until the Admiralty department was abolished in 1964, however it continued under the new Ministry of Defence but the structure and responsibilities of the agency changed over time.