 He went on to command the 5th Destroyer Flotilla in 1933 and the Royal Navy Gunnery School at Chatham in 1935 before becoming director of training and staff duties at the Admiralty in 1936.He was given command of the aircraft carrier in 1937 and was made Aide-de-camp to the King in 1939.In the Second World War Lyster was initially rear-admiral in charge of HM Dockyard Scapa Flow and then from 1940 saw further active service as rear-admiral in charge of the Aircraft Carriers in the Mediterranean Fleet.