In October 1943, Cunningham became First Sea Lord and Chief of the Naval Staff, after the death of Sir Dudley Pound. This promotion meant that he had to relinquish his coveted post of Commander-in-Chief, Mediterranean, recommending his namesake Admiral John H. D. Cunningham as his successor. In the position of First Sea Lord, and as a member of the Chiefs of Staff committee, Cunningham was responsible for the overall strategic direction of the navy for the remainder of the war. He attended the major conferences at Cairo, Tehran, Yalta and Potsdam, at which the Allies discussed future strategy, including the invasion of Normandy and the deployment of a British fleet to the Pacific Ocean.