Admiral of the Fleet Sir Arthur John Power, was a Royal Navy officer. He took part in the First World War as a gunnery officer and saw action in the Dardanelles campaign. During the inter-war years he commanded the gunnery school at HMS Excellent and then the aircraft carrier HMS Ark Royal. During the Second World War he played a leading role in the planning for the Allied invasion of Sicily and for the Allied invasion of Italy and then commanded the naval forces for the actual landing of V Corps at Taranto in Italy in September 1943. He went on to be Commander-in-Chief of the East Indies Fleet in the closing stages of the war and conducted naval strikes on the Imperial Japanese Army in Borneo and Malaya. After the War he became Second Sea Lord and Chief of Naval Personnel, Commander-in-Chief, Mediterranean Fleet and then Commander-in-Chief, Portsmouth.

The Second Sea Lord and Deputy Chief of Naval Staff is deputy to the First Sea Lord and the second highest-ranking officer to currently serve in the Royal Navy and is responsible for personnel and naval shore establishments. Originally titled Second Naval Lord in 1830, the post was restyled Second Sea Lord in 1904. They are based at Navy Command, Headquarters.