the Military Defence Supplementary Measures Act. Before 2008, there were two classes – warrant officer class 1 and 2. A warrant officer class 1 could be appointed to positions such as regimental sergeant major, formation sergeant major or Sergeant Major of the Army or Warrant Officer of the Navy. In 2008, five new warrant officer ranks were introduced above warrant officer class 1: senior warrant officer (SWO), master warrant officer (MWO), chief warrant officer (CWO), senior chief warrant officer (SCWO) and master chief warrant officer (MCWO). United Kingdom Royal Navy In 1973, warrant officers reappeared in the Royal Navy, but these appointments followed the army model, with the new warrant officers being ratings rather than officers. They were initially known as fleet chief petty officers (FCPOs), but were renamed warrant officers in the 1980s. They rank with warrant officers class one in the British Army and Royal Marines and with warrant officers in the Royal Air Force. There are executive warrant officers for commands and ships. Five branches (surface ships, submarines, Royal Marines, Fleet Air Arm, and Maritime Reserves) each have a command warrant officer. The senior RN WO is the Warrant Officer of the Royal Navy. Under the Navy Command Transformation Programme, there are now a Fleet Commander's Warrant Officer and a Second Sea Lord's Warrant Officer, all working with the Warrant Officer of the Naval Service, taking over the roles of the Command Warrant Officers. In 2004, the rank of warrant officer class 2 was introduced. However, the rank was phased out in April 2014, but is being reinstated for non-technical and technical branches of the Royal Navy in 2021. British Army In the British Army, there are two warrant ranks, warrant officer class two (WO2) and warrant officer class one (WO1), the latter being the senior of the two. These ranks were previously abbreviated as WOII and WOI (using Roman instead of Indo-Arabic numerals). "Warrant officer first class" or "second class" is incorrect. The rank immediately below WO2 is staff sergeant (or colour sergeant). From 1938 to 1940 there was a WOIII platoon sergeant major rank. In March 2015, the new appointment of Army Sergeant Major was created, though the holder is not in fact a warrant officer but a commissioned officer holding the rank of captain. The creation of the appointment of command sergeant major was announced in 2009. Royal Marines Before 1879, the Royal Marines