|NATO rank code||OF-5|
|Next higher rank||Commodore|
|Next lower rank||Commander|
Captain (Capt) is a senior officer rank of the Royal Navy. It ranks above commander and below commodore and has a NATO ranking code of OF-5. The rank is equivalent to a colonel in the British Army and Royal Marines, and to a group captain in the Royal Air Force. There are similarly named equivalent ranks in the navies of many other countries.
In the Royal Navy, the officer in command of any warship of the rank of commander and below is informally referred to as "the captain" on board, even though holding a junior rank, but formally is titled "the commanding officer" (or CO). In former times, up until the nineteenth century, Royal Navy officers who were captains by rank and in command of a naval vessel were referred to as post-captains; this practice is now defunct.
A Captain (D) or Captain Destroyers afloat was an operational commander responsible for the command of destroyer flotilla or squadron,for a decade plus after the Second World War. The title was probably used informally up until the abolition of frigate and destroyer squadrons with the Fleet FIRST reorganisation circa 2001.
Ashore, the rank of captain is often verbally described as "captain RN" to distinguish it from the more junior Army and Royal Marines rank, and in naval contexts, as a "four-ring captain" (referring to the uniform lace) to avoid confusion with the title of a seagoing commanding officer. In the Ministry of Defence, and in joint service establishments, a captain may be referred to as a "DACOS" (standing for deputy assistant chief of staff) or an "AH" (assistant head), from the usual job title of OF5-ranked individuals who work with civil servants.
The rank insignia features four rings of gold braid with a loop in the upper ring.
When in mess dress or mess undress, officers of the rank of captain and above wear gold-laced trousers (the trousers are known as "tin trousers", and the gold lace stripes thereon are nicknamed "lightning conductors"), and may wear the undress tailcoat (without epaulettes).
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.
This is a table of the ranks and insignia of the Canadian Armed Forces. As the Canadian Armed Forces is officially bilingual, the French language ranks are presented following the English.
Group captain is a senior commissioned rank in the Royal Air Force, where it originated, as well as the air forces of many countries that have historical British influence. It is sometimes used as the English translation of an equivalent rank in countries which have a non-British air force-specific rank structure. Group captain has a NATO rank code of OF-5, meaning that it ranks above wing commander and immediately below air commodore, and is the equivalent of the rank of captain in the navy and of the rank of colonel in other services.
Officer Cadet is a rank held by military cadets during their training to become commissioned officers. In the United Kingdom, the rank is also used by members of University Royal Naval Units, University Officer Training Corps and University Air Squadron; however, these are not trainee officers with many not choosing a career in the armed forces.
Mess dress uniform is the most formal type of uniforms used by military personnel, police personnel, and other uniformed services members. It frequently consists of a mess jacket, trousers, white dress shirt and a black bow tie, along with orders and medals insignia. Design may depend on regiment or service branch, e.g. army, navy, air force, marines, etc. In Western dress codes, mess dress uniform is the supplementary alternative equivalent to the civilian black tie for evening wear or black lounge suit for day wear although military uniforms are the same for day and evening wear. Mess dress uniforms are typically less formal than full dress uniform, but more formal than service dress uniform.
Colonel is a Canadian Forces rank used by commissioned officers in the Canadian Army and Royal Canadian Air Force. Captain(N) is the equivalent rank in the Royal Canadian Navy. A colonel is senior to the army and air force rank of lieutenant-colonel or the naval rank of commander, and junior to the army and air force rank of brigadier-general or the naval rank of commodore.
Full dress uniform, also known as a ceremonial dress uniform or parade dress uniform, is the most formal type of uniforms used by military, police, fire and other public uniformed services for official parades, ceremonies, and receptions, including private ones such as marriages and funerals. Full dress uniforms typically include full-size orders and medals insignia. Styles tend to trace back to uniforms used during the 19th century, although the 20th century saw the adoption of mess dress-styled full-dress uniforms. Designs may depend on regiment or service branch. In Western dress codes, full dress uniform is a permitted supplementary alternative equivalent to the civilian white tie for evening wear or morning dress for day wear – sometimes collectively called full dress – although military uniforms are the same for day and evening wear. As such, full dress uniform is the most formal uniform, followed by the mess dress uniform.
Commodore (Cdre) is a rank of the Royal Navy above captain and below rear admiral. It has a NATO ranking code of OF-6. The rank is equivalent to brigadier in the British Army and Royal Marines and to air commodore in the Royal Air Force. Commodore has only been a substantive rank in the Royal Navy since 1997. Until then the term denoted a functional position rather than a formal rank, being the title bestowed on the senior officer of a fleet of at least two naval vessels comprising an independent command.
Commodore was an early title and later a rank in the United States Navy, United States Coast Guard and the Confederate States Navy, and also has been a rank in the United States Public Health Service Commissioned Corps and the National Oceanic and Atmospheric Administration Commissioned Officer Corps and its ancestor organizations. For over two centuries, the designation has been given varying levels of authority and formality.
The uniforms of the United States Navy include dress uniforms, daily service uniforms, working uniforms, and uniforms for special situations, which have varied throughout the history of the navy. For simplicity in this article, officers refers to both commissioned officers and warrant officers.
The uniforms of the Canadian Armed Forces are the official dress worn by members of Canada's military while on duty.
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.
The Royal Air Force uniform is the standardised military dress worn by members of the Royal Air Force. The predominant colours of Royal Air Force uniforms are blue-grey and Wedgwood blue. Many Commonwealth air forces' uniforms are also based on the RAF pattern, but with nationality shoulder flashes. The Royal Air Force Air Cadets wear similar uniforms.
The uniforms of the Royal Navy have evolved gradually since the first uniform regulations for officers were issued in 1748. The predominant colours of Royal Navy uniforms are navy blue and white. Since reforms in 1997 male and female ratings have worn the same ceremonial uniform.
Commander is a senior officer rank of the Royal Navy of the United Kingdom. It is immediately junior to captain and immediately senior to the rank of lieutenant commander. Officers holding the junior rank of lieutenant commander are not considered to be commanders.
In the United States, commander is a military rank that is also sometimes used as a military billet title—the designation of someone who manages living quarters or a base—depending on the branch of service. It is also used as a rank or title in non-military organizations; particularly in law enforcement.
The uniforms of the Royal Canadian Navy are a variety of different official dress worn by members of the Royal Canadian Navy while on duty. Originally, the uniforms of the RCN were modelled after their counterparts from the United Kingdom. However, after the RCN was merged with the Canadian Army, and the Royal Canadian Air Force in 1968 to form the single-service Canadian Armed Forces, the RCN began to wear "Canadian Armed Forces Green" uniforms, worn throughout the Canadian Armed Forces
Royal Navy ranks, rates, and uniforms of the 18th and 19th centuries were the original effort of the Royal Navy to create standardized rank and insignia system for use both at shore and at sea.
In the United States Navy, United States Coast Guard, United States Public Health Service Commissioned Corps (USPHS), and National Oceanic and Atmospheric Administration Commissioned Officer Corps, captain is the senior-most commissioned officer rank below that of flag officer. The equivalent rank is colonel in the United States Army, Air Force, Space Force, and Marine Corps.
The Royal Marines uniform is the standardised military dress worn by members of the Royal Marines.