Her Majesty's Naval Service, also known as the Senior Service, is the United Kingdom's naval warfare and maritime service. It consists of the Royal Navy, Royal Marines, Naval Careers Service, Royal Marines Band Service and Queen Alexandra's Royal Naval Nursing Service. The term Naval Service should be distinguished from the "UK Naval Services", which consist of the Naval Service and the Merchant Navy. The Naval Service as a whole falls under the command of the Navy Board, which is headed by the First Sea Lord. This position is currently held by Admiral Sir George Zambellas (appointed April 2013). The Defence Council delegates administration of the Naval Service to the Admiralty Board, chaired by the Secretary of State for Defence.