the creation of two sub-committees of the Board—the Operations Committee and the Maintenance Committee. The First Lord of the Admiralty was chairman of both committees, and the Operations Committee consisted of the First Sea Lord and Chief of Naval Staff, the Deputy First Sea Lord, Assistant Chief of Naval Staff, and Fifth Sea Lord. Full operational control of the Royal Navy was finally handed over to the Chief of Naval Staff (CNS) by an order in Council, effective October 1917, under which he became responsible for the issuing of orders affecting all war operations directly to the fleet. It also empowered the CNS to issue orders in their own name, as opposed to them previously being issued by the Permanent Secretary of the Admiralty in the name of the Board. In 1964, the Admiralty—along with the War Office and the Air Ministry—were abolished as separate departments of state, and placed under one single new Ministry of Defence. Within the expanded Ministry of Defence are the new Admiralty Board which has a separate Navy Board responsible for the day-to-day running of the Royal Navy, the Army Board and the Air Force Board, each headed by the Secretary of State for Defence. Organizational structure In the 20th century the structure of the Admiralty Headquarters was predominantly organized into four parts: The Board of Admiralty, which directs and controls the whole machine chaired by a civilian government minister the First Lord of the Admiralty. His chief military adviser was the First Sea Lord and Chief of Naval Staff as the Senior Naval Lord to the board. The Admiralty Naval Staff, advised and assisted the Board in chief strategic and operational planning, in the distributing of fleets and the allocating of assets to major naval commands and stations and in formulating official policy on tactical doctrine and requirements in regard to men and material. In order to deliver this the Naval Staff was organised into specialist Divisions and Sections. When the Admiralty unified with the Ministry of Defence in 1964 they were re designated as Directorates of the Naval Staff. The Admiralty Departments, which provides the men, ships, aircraft and supplies to carry out the approved policy. The departments are superintended by the various offices of the Sea Lords. The Department of the Permanent Secretary which was the general co-ordinating agency, regulating naval finance, providing advice on policy, conducing all correspondence on behalf of