Warrant officer (WO) is a rank or category of ranks in the armed forces of many countries. Depending on the country, service, or historical context, warrant officers are sometimes classified as the most junior of the commissioned officer ranks, the most senior of the non-commissioned officer (NCO) ranks, or in a separate category of their own. Warrant officer ranks are especially prominent in the militaries of Commonwealth nations and the United States.
A non-commissioned officer (NCO) is a military officer who does not hold a commission. Non-commissioned officers usually earn their position of authority by promotion through the enlisted ranks. In contrast, commissioned officers usually enter directly from a military academy, officer training corps (OTC) or reserve officer training corps (ROTC), or officer candidate school (OCS) or officer training school (OTS), after receiving a post-secondary degree.
Sergeant (Sgt) is a rank in use by the armed forces of many countries. It is also a police rank in some police services. The alternative spelling, serjeant, is used in The Rifles and other units that draw their heritage from the British light infantry. Its origin is the Latin serviens, 'one who serves', through the Old French term serjant.
Staff sergeant is a rank of non-commissioned officer used in the armed forces of many countries. It is also a police rank in some police services.
Sergeant major is a senior non-commissioned rank or appointment in many militaries around the world. Sergeants Major serve as the senior enlisted advisor to the commander.
A chief petty officer (CPO) is a senior non-commissioned officer in many navies and coast guards, usually above petty officer.
Flight lieutenant is a junior officer rank used by some air forces, with origins from the Royal Air Force. The rank originated in the Royal Naval Air Service (RNAS) in 1914. It fell into abeyance when the RNAS merged with the Royal Flying Corps during the First World War but was revived in 1919 in the post-war RAF. The rank is used by air forces of many countries that have historical British influence.
Pilot officer is a junior officer rank used by some air forces, with origins from the Royal Air Force. The rank is used by air forces of many countries that have historical British influence.
The Air Training Corps (ATC) is a British volunteer youth organisation; aligned to, and fostering the knowledge and learning of military values, primarily focusing on military aviation. Part of the Royal Air Force Air Cadets (RAFAC), the ATC is sponsored by the Royal Air Force (RAF) and the wider Ministry of Defence (MoD). The majority of Air Training Corps staff are volunteers, though some staff are paid for full-time work; including Commandant Air Cadets, who is a Royal Air Force officer as part of a Full Term Reserve Service commitment.
Flight sergeant is a senior non-commissioned rank in the Royal Air Force and several other air forces which have adopted all or part of the RAF rank structure. It is equivalent to a staff sergeant or colour sergeant in the British Army, a colour sergeant in the Royal Marines, and a chief petty officer in the Royal Navy, and has a NATO rank code of OR-7. In the RAF, flight sergeant ranks above chief technician and below warrant officer.
The title flight officer was a military rank used by the United States Army Air Forces during World War II, and also an air force rank in several Commonwealth countries, where it was used for female officers and was equivalent to the rank of flight lieutenant. The term flight officer is sometimes used today to describe job title positions as aircrew members.
The South African National Defence Force's rank system is largely based on the British system, with the Air Force sharing the Army rank titles.
The Indian Air Force (IAF), the aerial component of the Indian Armed Forces follows a certain hierarchy of rank designations and insignia derived from the erstwhile Royal Indian Air Force (RIAF).
The term used in the Royal Air Force (RAF) to refer to all ranks below commissioned officer level is other ranks (ORs). It includes warrant officers (WOs), non-commissioned officers (NCOs) and airmen.
Before Unification as the Canadian Armed Forces in 1968, the Canadian military had three distinct services: the Royal Canadian Navy, the Royal Canadian Air Force, and the Canadian Army. All three services had a Regular (full-time) component and a reserve (part-time) component. The rank structure for these services were based on the services of the British military, the Royal Navy, the Royal Air Force, and the British Army. The change to a "Canadian" rank structure meant that many of the traditional (British) rank titles and insignia were removed or changed.
The rank structure of the Royal Australian Air Force (RAAF) has been inherited from the Royal Air Force (RAF). The RAF based its officer ranks on the Royal Navy, and its airmen ranks on the British Army.
This is a list of Royal Navy ratings rank insignia.
A warrant officer (WO) in the British Armed Forces is a member of the highest-ranking group of non-commissioned ranks, holding the King's Warrant, which is signed by the Secretary of State for Defence.
The following table displays the ranks of the Community Cadet Forces, the Combined Cadet Force, the Volunteer Cadet Corps, and the Girls Venture Corps Air Cadets. This table is based on equivalent Rank Structures within the Cadet Forces as detailed in regulations of the SCC, RMC, and the Air Cadets.
United Kingdom 
Royal Air Force 