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.
Lieutenant Commander is a commissioned officer rank in many navies. The rank is superior to a lieutenant and subordinate to a commander. The corresponding rank in most armies and air forces is major, and in the Royal Air Force and other Commonwealth air forces is squadron leader.
Commander is a common naval officer rank as well as a job title in many armies. Commander is also used as a rank or title in other formal organizations, including several police forces. In several countries this naval rank is termed frigate captain.
An aide-de-camp is a personal assistant or secretary to a person of high rank, usually a senior military, police or government officer, or to a member of a royal family or a head of state.
Sergeant major is a senior non-commissioned rank or appointment in many militaries around the world.
Marshal of the Royal Air Force (MRAF) is the highest rank in the Royal Air Force (RAF). In peacetime it was granted to RAF officers in the appointment of Chief of the Defence Staff (CDS), and to retired Chiefs of the Air Staff (CAS), who were promoted to it on their last day of service. While surviving Marshals of the RAF retain the rank for life, the highest rank to which officers on active service are promoted is now air chief marshal. Although general promotions to Marshal of the Royal Air Force have been discontinued since the British defence cuts of the 1990s, further promotions to the rank may still be made in wartime, for members of the Royal Family and certain very senior RAF air officers in peacetime at the discretion of the monarch; all such promotions in peacetime are only honorary, however. In 2012, the then Prince of Wales was promoted to the rank in recognition of his support for his mother, Queen Elizabeth II, in her capacity as head of the armed forces (commander-in-chief), while in 2014 Lord Stirrup, who had served as Chief of the Air Staff and Chief of the Defence Staff for over seven years, was also promoted.
Air commodore is a senior rank in the air forces of the United Kingdom and other countries including Australia, New Zealand, India, Pakistan and Zimbabwe. It is a one-star rank and is an air officer rank. It originated in, and continues to be used by the Royal Air Force.
Air Vice-Marshal (AVM) is a two-star air officer rank which originated in and continues to be used by the Royal Air Force. The rank is also used by the air forces of many countries which have historical British influence and it is sometimes used as the English translation of an equivalent rank in countries which have a non-English air force-specific rank structure.
The Commandant General Royal Marines is the professional head of the Royal Marines. The title has existed since 1943. The role is held by a General who is assisted by a Deputy Commandant General, with the rank of brigadier. This position is not to be confused with Captain General Royal Marines, the ceremonial head. The Commandant General Royal Marines is the counterpart to the Commandant of the United States Marine Corps.
Colonel commandant is a military title used in the armed forces of some English-speaking countries. The title, not a substantive military rank, could denote a senior colonel with authority over fellow colonels. Today, the holder often has an honorary role outside the executive military structure, such as advocacy for the troops.
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. Rank titles changed over time as did the insignia.
The rank insignia of the French Navy are worn on shoulder straps of shirts and white jackets, and on sleeves for navy jackets and mantels. Until 2005, only commissioned officers had an anchor on their insignia, but enlisted personnel are now receiving them as well. Although the names of the ranks for superior officers contain the word "Capitaine", the appropriate style to address them is "Commandant", "Capitaine" referring to "lieutenant de vaisseau", which is translated as lieutenant. The two highest ranks, Vice-amiral d'escadre and Amiral (Admiral), are functions, rather than ranks. They are assumed by officers ranking Vice-amiral (Vice-Admiral).
The officer ranks of the Royal Air Force, as they are today, were introduced in 1919. Prior to that Army ranks were used.
Lieutenant general, formerly more commonly lieutenant-general, is a senior rank in the British Army and the Royal Marines. It is the equivalent of a multinational three-star rank; some British lieutenant generals sometimes wear three-star insignia, in addition to their standard insignia, when on multinational operations.
These are the official Royal Navy Officer ranks ordered by rank. These ranks are part of the NATO/United Kingdom ranks, including modern and past. Past insignia is in italic.
Brigadier (Brig) is a senior rank in the British Army and the Royal Marines. Brigadier is the superior rank to colonel, and subordinate to major-general. It corresponds to the rank of brigadier general in many other nations.
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.
Lieutenant commander is a senior officer rank in the Royal Navy of the United Kingdom. It is immediately junior to commander and immediately senior to the naval rank of lieutenant.
United Kingdom 
British Army 
Royal Marines 