serve as parent units for naval clearance divers: Clearance Diving Team 1 (AUSCDT ONE), based at HMAS Waterhen in New South Wales; and Clearance Diving Team 4 (AUSCDT FOUR), based at HMAS Stirling in Western Australia. When clearance divers are sent into combat, Clearance Diving Team Three (AUSCDT THREE) is formed. The CDTs have two primary roles: Mine counter-measures (MCM) and explosive ordnance disposal (EOD); and Maritime tactical operations. Personnel , the RAN has 15,285 permanent full-time personnel, 161 gap year personnel, and 3,932 reserve personnel. The permanent full-time trained force consisted of 2,914 commissioned officers, and 10,056 enlisted personnel. In June 2021, male personnel made up 73% of the permanent full-time force, while female personnel made up 23%. The RAN has the second-highest percentage of women in the permanent forces, compared to the RAAF's 25.5% and the Army's 15.1%. The following are some of the current senior Royal Australian Navy officers: Vice Admiral David Johnston – Vice Chief of the Defence Force Vice Admiral Mark Hammond – Chief of Navy Vice Admiral Jonathan Mead – Chief Nuclear-Powered Submarine Taskforce Rear Admiral Jonathan Earley – Deputy Chief of Navy Rear Admiral Christopher Smith – Commander Australian Fleet Rear Admiral Matthew Buckley – Head Nuclear-Powered Submarine Capability Rear Admiral Peter Quinn – Head Navy Capability Rear Admiral Kath Richards – Head Navy Engineering Rear Admiral Bruce Kafer – Director-General Australian Navy Cadets and Reserves Commodore Brett Brace – Hydrographer of Australia Warrant Officer Deb Butterworth – Warrant Officer of the Navy Ranks and uniforms Commissioned Officers Commissioned officers of the Australian Navy have pay grades ranging from S-1 to O-11. The only O-11 position in the navy is honorary and has only ever been held by royalty, most recently being held by The Duke of Edinburgh as the Lord High Admrial of the United Kingdom. The highest rank achievable in the current Royal Australian Navy structure is O-10, an admiral who serves as the Chief of the Defence Force (CDF) when the position is held by a Naval Officer. O-8 (rear admiral) to O-11 (admiral of the fleet) are referred to as flag officers, O-5 (commander) and above are referred to as senior officers, while S-1 (midshipman) to O-4 (lieutenant commander) are referred to as junior officers. All RAN Officers are issue a commission by the Governor General of Australia as Commander-in-Chief on behalf of His Majesty King Charles III, King