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Military rank is a system of hierarchical relationships in armed forces or civil institutions organized along military lines. Usually, uniforms denote the bearer's rank by particular insignia affixed to the uniforms. Ranking systems have been known for most of military history to be advantageous for military operations, in particular with regards to logistics, command, and coordination; as time continued and military operations became larger and more complex, military ranks increased and ranking systems themselves became more complex.
Within modern armed forces, the use of ranks is almost universal. Communist states have sometimes abolished rank (e.g., the Soviet Russian Red Army 1918–1935,[1] the Chinese People's Liberation Army 1965–1988,[2] and the Albanian Army 1966–1991[3]), only to re-establish them after encountering operational difficulties of command and control.
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From 501 BC the Athenians annually elected ten individuals to the rank of strategos, one for each of the ten "tribes" that had been created with the founding of the democracy. Strategos literally means "army leader" and so it is usually translated as "general". Originally these generals worked together with the old polemarchos ("war lord") but over time the latter figure was absorbed into the generalship: each of the ten generals would rotate as polemarch for one day, and during this day his vote would serve as tie-breaker if necessary.
The ten generals were equals to one another; there was no hierarchy among them, however a basic form of democracy was in effect: For example, at the Battle of Marathon in 490 BC, the generals determined the battle plan by majority vote. Particular assignments, however, might have been given to individual generals; inevitably there was a regular division of responsibilities.
The rank that was subordinate to a top general was a taxiarchos or taxiarhos, something akin to the modern brigadier. In Sparta, however, the title was polemarchos. Below this was the syntagmatarchis, which can be translated as "leader of a regiment" (syntagma) and was therefore like a modern colonel. Below him was the tagmatarches, a commanding officer of a tagma (near to the modern battalion). The rank was roughly equivalent to the legatus of a Roman legion. Next was the lokhagos, an officer who led an infantry unit called a lokhos that consisted of roughly a hundred men, much the same as in a modern company led by a captain.
A Greek cavalry (hippikon) regiment was called a hipparchia and was commanded by a hipparchos or hipparch, but Spartan cavalry was led by a hipparmostes. A hippotoxotès was a mounted archer. A Greek cavalry company was led by a tetrarchès or tetrarch.
The rank and file of the military in most of the Greek city states was composed of ordinary citizens. Heavily armed foot soldiers were called hoplitès or hoplites and a hoplomachos was a drill or weapons instructor.
Once Athens became a naval power, the top generals of the land armies had authority over the naval fleets as well. Under them, each warship was commanded by a trièrarchos or trierarch, a word which originally meant "trireme officer" but persisted when other types of vessels came into use. Moreover, as in modern navies, the different tasks associated with running a ship were delegated to different subordinates. Specifically, the kybernètès was the helmsman, the keleustēs managed the rowing speed, and the trièraulès was the flute player who maintained the strike rate for the oarsmen. Following further specialization, the naval strategos was replaced by a nauarchos, a sea officer equating to an admiral.
With the rise of Macedonia under Philip II of Macedon and Alexander the Great, the Greek military became professional, tactics became more sophisticated and additional levels of ranking developed. Foot soldiers were organized into heavy infantry phalanxes called phalangites. These were among the first troops ever to be drilled, and they fought packed in a close rectangular formation, typically eight men deep, with a leader at the head of each column (or file) and a secondary leader in the middle so that the back rows could move off to the sides if more frontage was needed.
A tetrarchia was a unit of four files and a tetrarchès or tetrarch was a commander of four files; a dilochia was a double file and a dilochitès was a double-file leader; a lochos was a single file and a lochagos was a file leader; a dimoiria was a half file and a dimoirites was a half-file leader. Another name for the half file was a hèmilochion with a hèmilochitès being a half-file leader.
Different types of units, however, were divided differently and therefore their leaders had different titles. For example, under a numbering system by tens, a dekas or dekania was a unit of ten led by a dekarchos, a hekatontarchia was a unit of hundred led by a hekatontarchos and a khiliostys or khiliarchia was a unit of a thousand led by a khiliarchos.
The cavalry, for which Alexander became most famous (in a military sense), grew more varied. There were heavy cavalry and wing cavalry (ilè) units, the latter commanded by an ilarchos.
The use of formalized ranks came into widespread use with the Roman legions after the reforms by Marius. Under the new system, a legion would be commanded by a legate (legatus), typically a senator, for a three-year term. Immediately beneath the legate were six military tribunes (tribuni militum), five of whom were young men of Equestrian rank and one of whom was a nobleman who was headed for the Senate.
The tribuni militari were the Roman army's senior officers who commanded the rough equivalents to the US and British armies battalions and brigades (the relevant modern ranks being major, lieutenant colonel, colonel and brigadier general). Note that these comparisons are only loose because the Roman army's command structure was much different from the organizational structure of its modern counterparts, which arose from the medieval mercenary companies, rather than from the writings of Fourth Century Roman writer Vegetius and Caesar's commentaries on his conquest of Gaul and the civil war.
The term military tribune is sometimes translated into English as "colonel" — most notably by the late classicist Robert Graves in his "Claudius" novels and his translation of Suetonius' Twelve Caesars — to avoid confusion with the political "tribunes of the people."
The fighting men in the legion were formed into ranks, rows of men who fought as a unit. Under Marius's new system, legions were divided into ten cohorts (cohortes), each consisting of six centuries, each of between 60 and 160 men. Each century was led by a centurion (centurio) who was assisted by a number of junior officers, such as an Optio. Centuries were further broken into ten contubernia of eight soldiers each. The most senior centurion in a legion was called primus pilus. The ranks of centurions in the individual cohorts were, in descending order, pilus prior, pilus posterior, princeps prior, princeps posterior, hastatus prior, and hastatus posterior.[4] Individual soldiers were referred to as soldiers (milites) or legionaries (legionarii).
Roman discipline was severe, with all ranks subject to corporal and capital punishment at the commander's discretion. For example, if a cohort broke in battle, the typical punishment was decimation, in which every tenth soldier, selected by lot, was killed. Decimation was not commonplace as lack of men would reduce combat effectiveness, which would eventually overcome the psychological "benefit" of keeping the troops in-line.
There were no ranks in the modern sense of a hierarchy of titles, although the army was organized into a hierarchical command. The organization of the army was based on the decimal system, invented by Oguz Khagan, much like that of the Achaemenid Empire of Persia. The army was built upon a squad of ten (aravt) led by an appointed chief. Ten of these would then compose a company of a hundred (zuut), also led by an appointed chief. The next unit was a regiment of a thousand (myangat) led by an appointed noyan. The largest organic unit was a ten thousand man unit (tumen) also led by an appointed noyan.[5] Ranking hierarchy: One commander for each ten-thousand-army directly serves Khan. Head of Ten thousand, Head of Thousand, Head of Hundred, Head of Ten When the area of the country reaches enormous size, it is divided into suitable size of Khangziers and one of these Khanziers become the Great Khangzier. Each of these Khangzier has its own army, own administration. But all are accountable to the Great Khangzier. The Khangzier which is located at the furthest east become the Great Khangzier, since the East is a holy direction for Turks and Mongols.
The army of ancient Persia consisted of manageable military groupings under the individual commands. Starting at the bottom, a unit of 10 was called a dathabam and was led by a dathapatish. A unit of 1,000 was a hazarabam and was commanded by a hazarapatish. A unit of 10,000 was a baivarabam and was commanded by a baivarapatish. The Greeks called such masses of troops a myrias or myriad. Among mounted troops, an asabam was a cavalry unit led by an asapatish.
Historians have discovered the existence of the following ranks in Parthian and Sassanian armies:
There were not any real ranks in the Medieval or Dark age armies of Europe. Authority was based on position in the feudal hierarchy. Vassals would often be given some measure of command over the knights and men-at-arms they supplied the king during wartime, but there was no defined chain of command, and all major decisions rested with the king (or appointed field marshal) and his advisers.
The king’s army was placed under the command of the High Constable as commander-in-chief. The High Constable had authority over the local constables, commanders of the garrisons of major castles. The High Constable had the help of the Field Marshal, an officer that set up the army’s camp. (Marshals acted as chiefs of logistics and were also employed by royal and noble courts.) The High Constable derived his authority over the army from his role of head of the Cavalry.
As the Middle Ages came to an end, the rank structure of medieval armies became more formalized. The top officers were known as commissioned officers because their rank came from a royal commission. Army commissions were reserved for the elite — the aristocracy of mainland Europe and the aristocracy and gentry of Great Britain.
The basic unit of the medieval army was the company, a band of soldiers assigned (or raised) by a vassal lord on behalf of his lord (in later times the King himself). The vassal lord in command of the company was a commissioned officer with the rank of captain. Captain was derived from the Late Latin word capitaneus (meaning head man or chief).
The commissioned officer assisting the captain with command of the company was the lieutenant. Lieutenant was derived from the French language; the lieu meaning “place” as in a position; and tenant meaning “holding” as in “holding a position”; thus a “lieutenant” is somebody who holds a position in the absence of his superior. When he was not assisting the captain, the lieutenant commanded a unit called a platoon, particularly a more specialized platoon. The word is derived from the 17th-century French peloton, meaning a small ball or small detachment of men, which came from pelote, a ball.
The commissioned officer carrying the (infantry) company’s flag was the ensign. The word ensign was in fact derived from the Latin word insignia. In cavalry companies the equivalent rank was cornet. In English usage, these ranks were merged into the single rank of Second Lieutenant in the 19th Century.
Not all officers received a commission from the King. Certain specialists were granted a warrant, certifying their expertise as craftsmen. These warrant officers assisted the commissioned officers but ranked above the noncommissioned officers. They received their authority from superior officers rather than the King. The first NCOs were the armed servants (men-at-arms) of the aristocracy, assigned to command, organize and train the militia units raised for battle. After years of commanding a squad, an NCO could be promoted to sergeant, the highest NCO rank. While a sergeant might have commanded a squad upon promotion, he usually became a staff officer. While commissioned staff officers assisted their commander with personnel, intelligence, operations and logistics, the sergeant was a jack of all trades, concerning himself with all aspects of administration to maintain the enlisted men serving under his commander. Over time, sergeants were differentiated into many ranks as various levels of sergeants were used by the commanders of various levels of units.
A corporal commanded a squad. Squad derived from the Italian word for a “square” or “block” of soldiers. In fact, corporal was derived from the Italian caporal de squadra (head of the squad). Corporals were assisted by lancepesades. Lancepesades were veteran soldiers; lancepesade was derived from the Italian "lancia spezzata" meaning broken spear - the broken spear being a metaphor for combat experience, where such an occurrence was likely. The first lancepesades were simply experienced privates; who either assisted their corporal or performed the duties of a corporal themselves. It was this second function that made armies increasingly regard their lancepesades as a grade of corporal rather than a grade of private. As a result, the rank of Lance Corporal was derived from combining lancepesade and corporal.
As the Middle Ages came to an end, kings increasingly relied on professional soldiers to fill the bottom ranks of their armies instead of militiamen. Each of these professionals began their careers as a private. The private was a man who signed a private contract with the company commander, offering his services in return for pay. The money was raised through taxation; those yeomen (smallholding peasants) who did not fulfill their annual 40-day militia service paid a tax that funded professional soldiers recruited from the yeomanry. This money was handed to the company commanders from the royal treasury, the company commanders using the money to recruit the troops.
As armies grew larger, composed of multiple companies, one captain was granted general (overall) authority over the field armies by the King. (National armies were the armies of the kings. Field armies were armies raised by the King to enter the battle field in preparation for major battles.) In French history, “lieutenant du roi” was a title born by the officer sent with military powers to represent the king in certain provinces. A lieutenant du roi was sometimes known as a lieutenant general to distinguish him from lieutenants subordinate to mere captains. The sergeant acting as staff officer to the captain general was known as the sergeant-major general. This was eventually shortened to major general, while captain general was shortened to simply general. This is the reason a major outranks a lieutenant, but a lieutenant general outranks a major general.
As armies grew bigger, heraldry and unit identification remained primarily a matter of the regiment. Brigades headed by brigadier generals were the units invented as a tactical unit, by the Swedish king Gustavus Adolphus the second ("Gustav II Adolf," who was killed at the battle of Lützen 1632). It was introduced to overcome the normal army structure, consisting of regiments. The so-called “brigada” was a mixed unit, comprising infantry, cavalry and normally artillery too, designated for a special task. The size of such “brigada” was a reinforced company up to two regiments. The “brigada” was a 17th century form of the modern “task force”. In some armies "Brigadier General" has been shortened to "Brigadier".
Around the end of the 16th century, companies were grouped into regiments. The officers commissioned to lead these regiments were in fact called colonels (column officers). They were first appointed in Spain by King Ferdinand II of Aragon where they were also known as coronellos (crown officers) since they were appointed by the Crown. Thus the English pronunciation of the word colonel.
The first colonels were captains granted command of their regiments by commission of the King. The lieutenants of the colonel were the lieutenant colonels. In the 17th century, the sergeant of the colonel was the sergeant major. These were field officers, third in command of their regiments (after their colonels and lieutenant colonels), with a role similar to the older, army-level sergeants major (although obviously on a smaller scale). The older position became known as sergeant major general to distinguish it. Over time, the sergeant was dropped from both titles since both ranks were used for commissioned officers. This gave rise to the modern ranks of major and major general.
The full title of sergeant major fell out of use until the latter part of the 18th century, when it began to be applied to the senior non-commissioned officer of an infantry battalion or cavalry regiment.
Regiments were later split into battalions with a lieutenant colonel as a commanding officer and a major as an executive officer.
Modern military services recognize three broad categories of personnel. These are codified in the Geneva Conventions, which distinguish officers, non-commissioned officers, and enlisted men.
Apart from conscripted personnel one can distinguish:
Officers are distinguished from other military members (or an officer in training) by holding a commission; they are trained or training as leaders and hold command positions.
Officers are further generally separated into four levels:
Officers who typically command units or formations that are expected to operate independently for extended periods of time (i.e., brigades and larger, or flotillas or squadrons of ships), are referred to variously as general officers (in armies, marines, and some air forces), flag officers (in navies and coast guards), or air officers (in some Commonwealth air forces).
General-officer ranks typically include (from the most senior) general, lieutenant general, major general, and brigadier general, although there are many variations like division general or (air-, ground-) force general.
Flag-officer ranks, named after the traditional practice of showing the presence of such an officer with a flag on a ship and often land, typically include (from the most senior) admiral, vice admiral and rear admiral. In some navies, such as Canada's, the rank of commodore is a flag rank.
In the United Kingdom and most other Commonwealth air forces, air-officer ranks usually include air chief marshal, air marshal, air vice-marshal and air commodore. For some air forces, however, such as those of Canada, United States and many other air forces, general officer rank titles are used. Brazil and Argentina use a system of general officer ranks based on the term brigadier.
In some forces there may be one or more superior ranks to the common examples, above, that are given distinguishing titles, such as field marshal or general of the armies (many armies), fleet admiral (U.S. Navy), marshal of the Royal Air Force, or other national air force. These ranks have often been discontinued, such as in Germany and Canada, or limited to wartime and/or honorific promotion, such as in the United Kingdom and the United States.
In various countries, particularly the United States, these may be referred to as "star ranks" for the number of stars worn on some rank insignia: typically one-star for Brigadier General or equivalent with the addition of a star for each subsequent rank. In the United States, five stars has been the maximum used in all services (excluding the Marines and Coast Guard, which have only used four). There is also a theoretical six-star rank held by John J. Pershing and to which George Washington was posthumously promoted, referred to as the General of the Armies of the United States. Additionally, see admiral of the Navy for the US Navy's Six-Star equivalent, awarded to Admiral George Dewey and subsequently removed after his death.
Some titles are not genuine ranks, but either functions assumed by generals or honorific titles. For instance, in the French Army général de corps d'armée is a function assumed by some généraux de division, and maréchal de France, which is a distinction denoting the most superior military office, but one that has often neutered the practical command powers of those on whom it is conferred. In the United States Navy, a commodore currently is a senior captain commanding a squadron that is too small for a rear admiral to command, although that name has historically been used as a rank. The title (not rank) of commodore can also indicate an officer who is senior to a ship's captain (since only the ship's commander is addressed as captain while underway). Marine captains are referred to as major to distinguish themselves while shipboard.
Field officers, also called "field-grade officers" or "senior officers", are officers who typically command units that can be expected to operate independently for short periods of time (i.e., infantry battalions, cavalry or artillery regiments, warships, air squadrons). Field officers also commonly fill staff positions of superior commands.
The term "field(-grade) officer" is primarily used by armies and marines; air forces, navies and coast guards generally prefer the term "senior officer." The two terms are not necessarily synonymous.
Typical army and marine field officer ranks include colonel ( /ˈkɜrnəl/), lieutenant colonel, major and, in the British army, captains holding an adjutant's appointment. In many Commonwealth countries the field rank of brigadier is used, although it fills the position held by brigadier general in other countries.
Naval and coast guard senior officer ranks include captain and commander. In some countries, the more senior rank of commodore is also included. In others lieutenant-commanders, as equivalents to army and marine majors, are considered senior officers.
Commonwealth air force senior officer ranks include group captain, wing commander, and squadron leader, where such ranks are still used.
The ranks of junior officers are the three or four lowest ranks of officers. Units under their command are generally not expected to operate independently for any significant length of time. Company grade officers also fill staff roles in some units. In some militaries, however, a captain may act as the permanent commanding officer of an independent company-sized army unit, for example a signal or field engineer squadron, or a field artillery battery.
Typical army company officer ranks include captain and various grades of lieutenant. Typical naval and coast guard junior officer ranks include grades of lieutenant commander, lieutenant, lieutenant junior grade and ensign. Commonwealth (excluding Canada) air force junior officer ranks usually include flight lieutenant, flying officer, and pilot officer.
"The [U.S.] commissioned officer corps is divided into 10 pay grades (O-1 through O-10). Officers in pay grades O-1 through O-3 are considered company grade officers. In the Army, Marine Corps, and Air Force, these pay grades correspond to the ranks of second lieutenant (O-1), first lieutenant (O-2), and captain (O-3), and in the Navy, ensign, lieutenant junior grade, and lieutenant. Officers in the next three pay grades (O-4 through O-6) are considered field grade officers. In the Army, Marine Corps, and Air Force, these pay grades correspond to the ranks of major (O-4), lieutenant colonel (O-5), and colonel (O-6), and in the Navy, lieutenant commander, commander, and captain. The highest four pay grades are reserved for general officers in the Army, Marine Corps, and Air Force, and flag officers in the Navy. The ranks associated with each pay grade are as follows: in the Army, Marine Corps, and Air Force, brigadier general (O-7), major general (O-8), lieutenant general (O-9), and general (O-10); in the Navy, rear admiral-lower half, rear admiral-upper half, vice admiral, and admiral."[6][7]
Officers in training in the Canadian Armed Forces are either naval cadet for Naval Training or officer cadet for Army or Air Force Training.
In the US and several other western forces, officers in training are referred to as student officers, and carry the rank of cadet (Army and Air Force) or midshipman (Navy, and in some countries, Marines). These officers may be serving at a military academy, or, as common in the United States, as members of a military training unit attached to a civilian college or university, such as an ROTC unit. This is due to a requirement that commissioned officers have at least a four-year degree. The British Army refers to its trainee officers as officer cadets (OCdt), who hold no authority over other ranks (except when appointed to carry out a role as part of training). OCdts are referred to as Mister/Miss until the completion of the early stages of their training, thereafter non-officers will refer to him/her as Sir/Ma'am.
While Cadet has always been a rank of limited authority and prestige (cadets and US Navy midshipmen have no authority over commissioned personnel, warrants, or officers, only subordinate cadets), midshipman has historically been a rank with limited leadership responsibility, particularly in the Royal Navy. This tradition was continued by the US Navy after its original adoption of the rank, but now US Navy midshipmen are limited in the same manner as cadets in the other US services. Additionally, US Marine officers in training are also midshipmen, trained and educated alongside their naval counterparts, and wear distinctive insignia to indicate their branch of service.
Note: US Coast Guard Academy students are referred to as cadets, while those attending the military branch's Officer Candidate School (OCS) are officer candidates.
In the US an alternative to spending four years as a cadet or midshipmen is for college graduates with a four-year degree to attend Officer Candidate School, an intensive twelve week training course designed to convert college graduates into military officers. Each service has at least one, and usually several, OCS facilities. Students at these programs are called officer candidates.
Warrant officers (as receiving authority by virtue of a warrant) are a hybrid rank treated slightly differently in each country and/or service. WOs may either be effectively senior non-commissioned officers or an entirely separate grade between commissioned and non-commissioned officers, usually held by specialist personnel.
In the United States, warrant officers are appointed by warrant then commissioned by the President of the United States at the rank of chief warrant officer.
Enlisted personnel are personnel below commissioned rank and make up the vast majority of military personnel. They are known by different names in different countries, such as other ranks (ORs) in the United Kingdom and some Commonwealth countries, and non-commissioned members (NCMs) in Canada.
Non-commissioned officers (NCOs) are enlisted personnel, under the command of an officer, granted delegated authority to supervise other military members or assigned significant administrative responsibilities. In U.S. Army parlance: "NCOs are the backbone of the Army!"[1] They are responsible for the care and direct control of junior military members, often functioning in the smaller field units as executive officers.
Even the most senior NCO officially ranks beneath the most junior commissioned officer or warrant officer. However, most senior NCOs have more experience, possibly including combat, than junior officers. In many armies, because junior officers have a great amount of responsibility and authority but little operational experience, they are paired with senior NCO advisers. In some organizations, senior NCOs may have formal responsibility and informal respect beyond that of junior officers, but less than that of warrant officers. Many warrant officers come from the ranks of mid-career NCOs. In some countries warrant ranks replace senior enlisted ranks.
NCO ranks typically include a varying number of grades of sergeant and corporal (Air Force, Army and Marines), or chief petty officer and petty officer (Navy and Coast Guard). In many navies the term rate is used to designate specialty, while rank denotes paygrade.
Warrant officers do not come under the non-commissioned officer branch. They are commissioned with a warrant.
Personnel with no command authority usually bear titles such as private, airman/aircraftman, or seaman (starting with seaman recruit in the United States Navy and Coast Guard). In the United States Marine Corps individuals of all ranks regardless of command status may be referred to as "marine". In some countries and services, personnel in different branches have different titles. These may have a variety of grades, such as private first class, but these usually only reflect variations in pay, not increased authority. These may or may not technically be ranks, depending on the country and/or service. Each rank gives the individual an indication of how long and how well they have served in combat and training.
Appointment refers to the instrument by virtue of which the person exercises his or her authority. Officers are appointed by a Royal Commission in most monarchies or a Presidential Commission in many other countries. In the Commonwealth, warrant officers hold a Royal or Presidential Warrant. In the United States, officers are appointed by the president, with the advice and consent of the United States Senate. Most officers are approved en bloc by voice vote, but flag officers are usually required to appear before the Armed Services Committee and answer questions to the satisfaction of its members, prior to a vote on their commission.
NCOs are appointed by an instrument of appointment, a written document, often a certificate, usually from the service head. Entry into service is often referred to as enlistment throughout the English speaking world, even in countries where soldiers do not technically enlist.
Sometimes personnel serve in an appointment which is higher than their actual rank. For instance, commodore used to be an appointment of captain in the Royal Navy and lance corporal used to be an appointment of private in the British Army.
There are a number of different forms of rank:
To get a sense of the practical meaning of these ranks—and thus to be able to compare them across the different armed services, different nations, and the variations of titles and insignia—an understanding of the relative levels and sizes of each command will be helpful. The ranking and command system used by U.S. Marine ground forces or U.S. Army infantry units can serve as a template for this purpose. It should be remembered that different countries will often use their own systems that don't match the presentation here.
Under this system, starting from the bottom and working up, a corporal leads a fireteam consisting of three other individuals. A sergeant leads a squad consisting of three fireteams. As a result, a full squad numbers 13 individuals. Squads usually have numbered designations (e.g., 1st Squad).
Generally, in most armies and marine units, a lieutenant or equivalent rank commands a platoon, which can consist of three or four squads. For example, in U.S. Marine infantry units, rifle platoons usually consist of three rifle squads of 13 men each, with a Navy corpsman, the platoon commander, and a platoon sergeant (i.e., a staff sergeant who serves as second-in-command). An infantry platoon can number from 42 to 55 individuals, depending on the service. Platoons are usually numbered (e.g., 1st Platoon) or named after their primary function (e.g., Service Platoon).
A captain or equivalent rank commands a company, usually consisting of four platoons (three line platoons and one heavy weapons platoon). His headquarters can include a first sergeant and as many as seven others. As such, a company can comprise from roughly 175 to 225 individuals. Equivalent units also commanded by captains are batteries (for field artillery units) and detachments. In English speaking countries, a company (or troop in the cavalry or armor, and battery in the artillery) is usually designated by a letter (e.g., A Company). In non-English speaking countries, they are usually numbered. In most Commonwealth armies a company is commanded by a major, assisted by a captain.
A lieutenant colonel or equivalent rank commands a battalion or a squadron, often consisting of four companies, plus the various members of his headquarters. A battalion is around 500–1,500 men and usually consists of between two and six companies.
A colonel or equivalent commands a regiment or group, often consisting of four battalions (for an Infantry unit) or five to six air groups (for a wing). Battalions and regiments are usually numbered, either as a separate battalion or as part of a regimental structure (e.g., 1-501st Infantry in the US Army).
In these latter, abstractions cease to be helpful and it becomes necessary to turn to an actual unit. The 1st Battalion of the 1st Marine Regiment of the 1st Marine Division of the I Marine Expeditionary Force consists of three infantry companies, one weapons company, and one headquarters and service company. Above that, the 1st Marine Regiment (aka First Marines) consists of four such battalions and one headquarters company. Marine Air Control Group 18 of 1st Marine Air Wing of the III Marine Expeditionary Force consists of four squadrons, one battery, and one detachment, a mix of different-sized units under a regimental equivalent-sized unit.
The next level has traditionally been a brigade, commanded by a brigadier general, and containing two or more regiments. But this structure is considered obsolete today. At the present time, in the U.S. Army, a brigade is roughly equal to or a little larger than a regiment, consisting of three to seven battalions. Strength typically ranges from 1,500 to 3,500 personnel. In the U.S. Marines, brigades are only formed for certain missions. In size and nature they are larger and more varied collections of battalions than is common for a regiment, fitting them for their traditional role as the smallest formation able to operate independently on a battlefield without external logistical tactical support. Brigades are usually numbered (e.g., 2nd Brigade).
The level above regiment and brigade is the division, commanded by a major general and consisting of from 10,000 to 20,000 persons. The 1st Marine Division, for example, is made up of four marine regiments (of the type described above), one assault amphibian battalion, one reconnaissance battalion, two light armored reconnaissance battalions, one combat engineer battalion, one tank battalion, and one headquarters battalion—totalling more than 19,000 marines. (Within the headquarters battalion are one headquarters company, one service company, one military police company, one communications company, and one truck company.) An equivalent elsewhere within the same marine expeditionary force (MEF) might be a MEF logistics group (MLG) - which is not a regimental-sized unit (as the word "group" implies), but rather a large support unit consisting of several battalions of support personnel. Divisions are normally numbered, but can be named after a function or personage.
Considering such a variety of units, the command sizes for any given rank will vary widely. Not all units are as troop intensive as infantry forces need to be. Tank and artillery crews, for example, involve far fewer personnel. Numbers also differ for non-combat units such as quartermasters, cooks, and hospital staff. Beyond this, in any real situation, not all units will be at full strength and there will be various attachments and detachments of assorted specialists woven throughout the system.
The 1st Marine Division is part of the I Marine Expeditionary Force, which also includes the 3rd Marine Air Wing, 1st Marine Logistics Group, 1st Marine Expeditionary Brigade (as required), three marine expeditionary units (featuring helicopter groups), and a battalion-sized marine air ground task force. In the U.S. Marine Corps there are three marine expeditionary forces.
In the U.S. Army, the level above division is called a corps instead of an expeditionary force. It is commanded by a lieutenant general. In many armies, a corps numbers around 60,000, usually divided into three divisions. Corps (and similar organizations) are normally designated with roman numerals and their nationality when operating in a combined (international) force, e.g. V (US) Corps, VIII (ROK) Corps, II MEF, I Canadian Corps.
During World War II, due to the large scale of combat, multiple corps were combined into armies commanded in theory by a general (four stars), but often by a lieutenant general (three stars), and comprising as many as 240,000 troops. Armies are numbered by spelled-out numerals or functional titles, using their nationality in "combined" forces (e.g., Eighth US Army, Third ROK Army, British Army of the Rhine). These were in their turn formed into army groups, these being the largest field organization handled by a single commander in modern warfare. Army groups included between 400,000 and 1,500,000 troops. Army groups received Arabic numeral designations and national designations when combined.
These examples illustrate a standard that holds true all over the world and throughout military history, namely that higher rank generally implies command of larger units in a nested system of ranks and commands. The specific size of a command for any given rank will, however, depend on the task the unit performs, the nature of weapons used, and the strategies of warfare.
See Comparative military ranks for detailed rank listing
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