It was not until 1917 that the admiralty department was again properly reorganized and began to function as a professional military staff. In May 1917, the term "Admiralty War Staff" was renamed and that department and its functional role were superseded by a new "Admiralty Naval Staff"; in addition, the newly created office of Chief of the Naval Staff was merged in the office of the First Sea Lord. Also appointed was a new post, that of Deputy Chief of the Naval Staff, and an Assistant Chief of the Naval Staff; all were given seats on the Board of Admiralty. This for the first time gave the naval staff direct representation on the board; the presence of three senior naval senior members on the board ensured the necessary authority to carry through any operation of war. The Deputy Chief of Naval Staff would direct all operations and movements of the fleet, while the Assistant Chief of Naval Staff would be responsible for mercantile movements and anti-submarine operations.