The fleet command of the Reichsmarine (Flottenkommando) was headquartered at Kiel and consisted of a flag staff and fleet commander embarked on board the flagship of the German fleet. During the 1920s, the German flagship was the SMS Schleswig-Holstein with two naval officers serving as fleet commander, Vizeadmiral Hans Zenker and Konrad Mommsen, between 1923 and 1927. The fleet commander position was then left vacant, but the flag staff remained.