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A regiment is a
military unit Military organization or military organisation is the structuring of the armed forces of a state so as to offer such military capability as a national defense policy may require. In some countries paramilitary forces are included in a nation' ...
. Its role and size varies markedly, depending on the country,
service Service may refer to: Activities * Administrative service, a required part of the workload of university faculty * Civil service, the body of employees of a government * Community service, volunteer service for the benefit of a community or a pu ...
and/or a specialisation. In
Medieval Europe In the history of Europe, the Middle Ages or medieval period lasted approximately from the late 5th to the late 15th centuries, similar to the post-classical period of global history. It began with the fall of the Western Roman Empire a ...
, the term "regiment" denoted any large body of
front-line A front line (alternatively front-line or frontline) in military terminology is the position(s) closest to the area of conflict of an armed force's personnel and equipment, usually referring to land forces. When a front (an intentional or unint ...
soldiers, recruited or conscripted in one geographical area, by a leader who was often also the
feudal lord An overlord in the Kingdom of England, English Feudalism in England, feudal system was a lord of the manor, lord of a manor who had Subinfeudation, subinfeudated a particular Manorialism, manor, Estate in land, estate or fief, fee, to a Leaseho ...
''in capite'' of the soldiers. Lesser barons of knightly rank could be expected to muster or hire a
company A company, abbreviated as co., is a Legal personality, legal entity representing an association of people, whether Natural person, natural, Legal person, legal or a mixture of both, with a specific objective. Company members share a common p ...
or
battalion A battalion is a military unit, typically consisting of 300 to 1,200 soldiers commanded by a lieutenant colonel, and subdivided into a number of companies (usually each commanded by a major or a captain). In some countries, battalions are ...
from their manorial estate. By the end of the 17th century, infantry regiments in most European armies were permanent units, with approximately 800 men and commanded by a
colonel Colonel (abbreviated as Col., Col or COL) is a senior military officer rank used in many countries. It is also used in some police forces and paramilitary organizations. In the 17th, 18th and 19th centuries, a colonel was typically in charge of ...
.


Definitions

During the modern era, the word "regiment" – much like "
corps Corps (; plural ''corps'' ; from French , from the Latin "body") is a term used for several different kinds of organization. A military innovation by Napoleon I, the formation was first named as such in 1805. The size of a corps varies great ...
" – may have two somewhat divergent meanings, which refer to two distinct roles: # a front-line military formation; or # an administrative or ceremonial unit. In many armies, the first role has been assumed by independent
battalion A battalion is a military unit, typically consisting of 300 to 1,200 soldiers commanded by a lieutenant colonel, and subdivided into a number of companies (usually each commanded by a major or a captain). In some countries, battalions are ...
s, battlegroups, task forces,
brigade A brigade is a major tactical military formation that typically comprises three to six battalions plus supporting elements. It is roughly equivalent to an enlarged or reinforced regiment. Two or more brigades may constitute a division. Br ...
s and other, similarly sized
operational An operational definition specifies concrete, replicable procedures designed to represent a construct. In the words of American psychologist S.S. Stevens (1935), "An operation is the performance which we execute in order to make known a concept." F ...
units. However, these non-regimental units tend to be short-lived; and regiments have tended to retain their traditional responsibilities for ceremonial duties, the recruitment of volunteers, induction of new recruits, individual
morale Morale, also known as esprit de corps (), is the capacity of a group's members to maintain belief in an institution or goal, particularly in the face of opposition or hardship. Morale is often referenced by authority figures as a generic value ...
and ''
esprit de corps Morale, also known as esprit de corps (), is the capacity of a group's members to maintain belief in an institution or goal, particularly in the face of opposition or hardship. Morale is often referenced by authority figures as a generic value ...
'', and administrative roles (such as pay). A regiment may consequently be a variety of sizes: * smaller than a standard
battalion A battalion is a military unit, typically consisting of 300 to 1,200 soldiers commanded by a lieutenant colonel, and subdivided into a number of companies (usually each commanded by a major or a captain). In some countries, battalions are ...
, e.g.
Household Cavalry Mounted Regiment The Household Cavalry Mounted Regiment (HCMR) is a cavalry regiment of the British Army tasked primarily with ceremonial duties. Part of the Household Division, it is classed as a regiment of guards, and carries out mounted (and some dismount ...
; * a battalion equivalent, e.g.
3rd Foreign Infantry Regiment The 3rd Foreign Infantry Regiment (french: 3e Régiment étranger d'infanterie, 3e REI) is an infantry regiment of the Foreign Legion in the French Army. The regiment is stationed in French Guiana. Its mission includes the protection of the C ...
; * a brigade equivalent, e.g.
8th Marine Regiment (United States) The 8th Marine Regiment was an infantry regiment of the United States Marine Corps. When last active, it was based at Marine Corps Base Camp Lejeune, North Carolina, and fell under the command of the 2nd Marine Division and the II Marine Expedi ...
; * several battalions, e.g. **
3rd U.S. Infantry Regiment (The Old Guard) The 3rd United States Infantry Regiment is a regiment of the United States Army. It currently has three active battalions, and is readily identified by its nickname, The Old Guard, as well as Escort to the President. The regimental motto is ' ...
and **
Royal Regiment of Scotland The Royal Regiment of Scotland is the British Army Order of Precedence, senior and only Scottish regiment, Scottish line infantry regiment of the British Army Infantry. It consists of three regular (formerly five) and two Army Reserve (United ...
; or * an entire
arm of service Military organization or military organisation is the structuring of the armed forces of a state so as to offer such military capability as a national defense policy may require. In some countries paramilitary forces are included in a nation's ...
, e.g. ** the
Royal Australian Regiment The Royal Australian Regiment (RAR) is the parent administrative regiment for regular infantry battalions of the Australian Army and is the senior infantry regiment of the Royal Australian Infantry Corps. It was originally formed in 1948 as a t ...
includes all of the Australian Army's regular infantry (other than reserve and special forces units), and ** the artillery units of the British Army are known collectively as the
Royal Regiment of Artillery The Royal Regiment of Artillery, commonly referred to as the Royal Artillery (RA) and colloquially known as "The Gunners", is one of two regiments that make up the artillery arm of the British Army. The Royal Regiment of Artillery comprises t ...
, which is sub-divided for operation purposes into
field regiment Field may refer to: Expanses of open ground * Field (agriculture), an area of land used for agricultural purposes * Airfield, an aerodrome that lacks the infrastructure of an airport * Battlefield * Lawn, an area of mowed grass * Meadow, a grass ...
s.


Historical origin

The French term ''régiment'' is considered to have entered military usage in Europe at the end of the 16th century, when armies evolved from collections of
retinue A retinue is a body of persons "retained" in the service of a noble, royal personage, or dignitary; a ''suite'' (French "what follows") of retainers. Etymology The word, recorded in English since circa 1375, stems from Old French ''retenue'', it ...
s who followed
knight A knight is a person granted an honorary title of knighthood by a head of state (including the Pope) or representative for service to the monarch, the church or the country, especially in a military capacity. Knighthood finds origins in the Gr ...
s, to formally organised, permanent military forces. At that time, regiments were usually named after their commanding colonels, and disbanded at the end of the campaign or war; the colonel and his regiment might recruit from and serve several
monarch A monarch is a head of stateWebster's II New College DictionarMonarch Houghton Mifflin. Boston. 2001. p. 707. Life tenure, for life or until abdication, and therefore the head of state of a monarchy. A monarch may exercise the highest authority ...
s or countries. Later, it was customary to name the regiment by its precedence in the
line of battle The line of battle is a tactic in naval warfare in which a fleet of ships forms a line end to end. The first example of its use as a tactic is disputed—it has been variously claimed for dates ranging from 1502 to 1652. Line-of-battle tacti ...
, and to recruit from specific places, called
cantons A canton is a type of administrative division of a country. In general, cantons are relatively small in terms of area and population when compared with other administrative divisions such as counties, departments, or provinces. Internationally, t ...
. The oldest regiments which still exist, and their dates of establishment, include the French 1st Infantry Regiment (1479), the
Spanish Spanish might refer to: * Items from or related to Spain: **Spaniards are a nation and ethnic group indigenous to Spain **Spanish language, spoken in Spain and many Latin American countries **Spanish cuisine Other places * Spanish, Ontario, Cana ...
9th Infantry Regiment “Soria” 9 (nine) is the natural number following and preceding . Evolution of the Arabic digit In the beginning, various Indians wrote a digit 9 similar in shape to the modern closing question mark without the bottom dot. The Kshatrapa, Andhra and ...
(1505), originally called ''
Tercio A ''tercio'' (; Spanish for " third") was a military unit of the Spanish Army during the reign of the Spanish Habsburgs in the early modern period. The tercios were renowned for the effectiveness of their battlefield formations, forming the el ...
de Nápoles''), the
Swedish Swedish or ' may refer to: Anything from or related to Sweden, a country in Northern Europe. Or, specifically: * Swedish language, a North Germanic language spoken primarily in Sweden and Finland ** Swedish alphabet, the official alphabet used by ...
Life Guards (1521), the British
Honourable Artillery Company The Honourable Artillery Company (HAC) is a reserve regiment in the British Army. Incorporated by royal charter in 1537 by King Henry VIII, it is the oldest regiment in the British Army and is considered the second-oldest military unit in the w ...
(1537) and the King's Own Immemorial Regiment of Spain, first established in 1248 during the conquest of
Seville Seville (; es, Sevilla, ) is the capital and largest city of the Spanish autonomous community of Andalusia and the province of Seville. It is situated on the lower reaches of the River Guadalquivir, in the southwest of the Iberian Peninsula ...
by King Ferdinand the Saint. In the 17th century, brigades were formed as units combining infantry, cavalry, and artillery that were more effective than the older, single-arms regiments; in many armies, brigades replaced regiments. Organisation and numbers did not follow any standardised pattern between or within armies during this period, with the only common factor being that each regiment had a single commander. By the beginning of the 18th century, regiments in most European continental armies had evolved into permanent units with distinctive titles and uniforms, each under the command of a colonel. When at full strength, an infantry regiment normally comprised two field battalions of about 800 men each or 8–10
companies A company, abbreviated as co., is a legal entity representing an association of people, whether natural, legal or a mixture of both, with a specific objective. Company members share a common purpose and unite to achieve specific, declared go ...
. In some armies, an independent regiment with fewer companies was labelled a demi-regiment. A cavalry regiment numbered 600 to 900 troopers, making up a single entity. On campaign, these numbers were soon reduced by casualties and detachments and it was sometimes necessary to amalgamate regiments or to withdraw them to a depot while recruits were obtained and trained. With the widespread adoption of
conscription Conscription (also called the draft in the United States) is the state-mandated enlistment of people in a national service, mainly a military service. Conscription dates back to antiquity and it continues in some countries to the present day un ...
in European armies during the nineteenth century, the regimental system underwent modification. Prior to World War I, an infantry regiment in the French, German, Russian, and other smaller armies would comprise four battalions, each with a full strength on mobilization of about 1,000 men. As far as possible, the separate battalions would be garrisoned in the same military district, so that the regiment could be mobilized and campaign as a 4,000 strong linked group of sub-units. A cavalry regiment by contrast made up a single entity of up to 1,000 troopers. A notable exception to this practice was the British line infantry system where the two regular battalions constituting a regiment alternated between "home" and "foreign" service and seldom came together as a single unit.


Regimental system

In the regimental system, each regiment is responsible for recruiting, training, and administration; each regiment is permanently maintained and therefore the regiment will develop its unique ''
esprit de corps Morale, also known as esprit de corps (), is the capacity of a group's members to maintain belief in an institution or goal, particularly in the face of opposition or hardship. Morale is often referenced by authority figures as a generic value ...
'' because of its unitary history, traditions, recruitment, and function. Usually, the regiment is responsible for recruiting and administering all of a soldier's military career. Depending upon the country, regiments can be either combat units or administrative units or both. This is often contrasted to the "continental system" adopted by many armies. In the continental system, the division is the functional army unit, and its commander is the administrator of every aspect of the
formation Formation may refer to: Linguistics * Back-formation, the process of creating a new lexeme by removing or affixes * Word formation, the creation of a new word by adding affixes Mathematics and science * Cave formation or speleothem, a secondar ...
: his staff train and administer the soldiers, officers, and commanders of the division's subordinate units. Generally, divisions are garrisoned together and share the same installations: thus, in divisional administration, a
battalion A battalion is a military unit, typically consisting of 300 to 1,200 soldiers commanded by a lieutenant colonel, and subdivided into a number of companies (usually each commanded by a major or a captain). In some countries, battalions are ...
commanding officer The commanding officer (CO) or sometimes, if the incumbent is a general officer, commanding general (CG), is the officer in command of a military unit. The commanding officer has ultimate authority over the unit, and is usually given wide latitu ...
is just another officer in a chain of command. Soldiers and officers are transferred in and out of divisions as required. Some regiments recruited from specific geographical areas, and usually incorporated the place name into the regimental name (e.g.
Bangladesh Infantry Regiment The Bangladesh Infantry Regiment (BIR) is an infantry regiment ( regimental system type) of the Bangladesh Army. It was raised in 2001 as the second combat regiment after the East Bengal Regiment. The regiment was raised initially by transferring ...
). In other cases, regiments would recruit from a given age group within a nation (e.g. Zulu
Impis is a Zulu word meaning war or combat and by association any body of men gathered for war, for example is a term denoting an army. were formed from regiments () from (large militarised homesteads). In English is often used to refer to a ...
), an ethnic group (e.g. the
Gurkhas The Gurkhas or Gorkhas (), with endonym Gorkhali ), are soldiers native to the Indian Subcontinent, chiefly residing within Nepal and some parts of Northeast India. The Gurkha units are composed of Nepalis and Indian Gorkhas and are recru ...
), or foreigners (e.g. the
French Foreign Legion The French Foreign Legion (french: Légion étrangère) is a corps of the French Army which comprises several specialties: infantry, Armoured Cavalry Arm, cavalry, Military engineering, engineers, Airborne forces, airborne troops. It was created ...
). In other cases, new regiments were raised for new functions within an army; e.g. the
Fusiliers Fusilier is a name given to various kinds of soldiers; its meaning depends on the historical context. While fusilier is derived from the 17th-century French word ''fusil'' – meaning a type of flintlock musket – the term has been used in co ...
, the Parachute Regiment (British Army), U.S. Army 75th Ranger Regiment, and the
Light Reaction Regiment The Light Reaction Regiment is the premier counter-terrorist unit of the Philippine Army. It was formerly known as the Light Reaction Battalion and Light Reaction Company. Due to its specialization in counter-terrorism operations and its formati ...
(
Philippine Army The Philippine Army (PA) ( Tagalog: ''Hukbong Katihan ng Pilipinas''; in literal English: ''Army of the Ground of the Philippines''; in literal Spanish: ''Ejército de la Tierra de la Filipinas'') is the main, oldest and largest branch of the ...
) . Disadvantages of the regimental system are hazardous regimental competition, a lack of interchangeability between units of different regiments, and more pronounced "
old boy network An old boy network (also known as old boys' network, ol' boys' club, old boys' club, old boys' society, good ol' boys club, or good ol' boys system) is an informal system in which wealthy men with similar social or educational background help ...
s" within the military that may hamper efficiency and fairness. A key aspect of the regimental system is that the regiment or battalion is the fundamental tactical building block. This flows historically from the colonial period, when battalions were widely dispersed and virtually autonomous, but is easily adapted to a number of different purposes. For example, a regiment might include different types of battalions (e.g. infantry or artillery) of different origins (e.g. regular or reserve). Within the regimental system, soldiers, and usually officers, are always posted to a tactical unit of their own regiment whenever posted to field duty. In addition to combat units, other organizations are very much part of the regimental family: regimental training schools, serving members on "extra-regimental employment", regimental associations (retirees), bands and associated cadet groups. The aspects that an administrative regiment might have in common include a symbolic colonel-in-chief (often a member of the royal family), a colonel of the regiment or "honorary colonel" who protects the traditions and interests of the regimental family and insists on the maintenance of high standards,
battle honours A battle honour is an award of a right by a government or sovereign to a military unit to emblazon the name of a battle or operation on its flags ("colours"), uniforms or other accessories where ornamentation is possible. In European military t ...
(honours earned by one unit of an administrative regiment are credited to the regiment), ceremonial uniforms,
cap badge A cap badge, also known as head badge or hat badge, is a badge worn on uniform headgear and distinguishes the wearer's nationality and/or organisation. The wearing of cap badges is a convention commonly found among military and police forces, as w ...
s, peculiarities of insignia,
stable belt A stable belt is a striped coloured belt worn at times by the armed forces of the United Kingdom and other Commonwealth countries – and a few other countries such as Denmark, Brazil and Lebanon. The stripes identify and vary by regiment and corps ...
s, and regimental marches and songs. The regiment usually has a traditional "home station" or
Regimental depot The regimental depot of a regiment is its home base for recruiting and training. It is also where soldiers and officers awaiting discharge or postings are based and where injured soldiers return to full fitness after discharge from hospital b ...
, which is often a historic
garrison A garrison (from the French ''garnison'', itself from the verb ''garnir'', "to equip") is any body of troops stationed in a particular location, originally to guard it. The term now often applies to certain facilities that constitute a mil ...
that houses the regimental museum and regimental headquarters. The latter has a modest staff to support regimental committees and administer both the regular members and the association(s) of retired members.


Advantages and disadvantages

The regimental system is generally admired for the ''
esprit de corps Morale, also known as esprit de corps (), is the capacity of a group's members to maintain belief in an institution or goal, particularly in the face of opposition or hardship. Morale is often referenced by authority figures as a generic value ...
'' it engenders in its units' members, but efforts to implement it in countries with a previously existing continental system usually do not succeed. The system presents difficulties for military planners, who must deal with the problems of trying to keep soldiers of a regiment together throughout their careers and of administering separate garrisons, training and mess facilities. The regimental community of serving and retired members often makes it very difficult for planners to restructure forces by moving, merging or re-purposing units. In those armies where the continental system exists, the regimental system is criticised as parochial and as creating unnecessary rivalry between different regiments. The question is also raised as to whether it is healthy to develop soldiers more loyal to their regiment than to the military in general. Regiments recruited from areas of political ferment (such as Scotland, Wales, Ireland,
Quebec Quebec ( ; )According to the Canadian government, ''Québec'' (with the acute accent) is the official name in Canadian French and ''Quebec'' (without the accent) is the province's official name in Canadian English is one of the thirtee ...
, India, etc.), tend to perform particularly well because of the loyalty their members exhibit to the regiments. Generally, the regimental system is found to function best in countries with small-to medium-sized military forces where the problems of administering vast numbers of personnel are not as prevalent. The regimental system works particularly well in an environment in which the prime role of the army consists of small-scale police actions and counterinsurgency operations, requiring prolonged deployment away from home. In such a situation, co-ordination between regiments is rarely necessary, and the esprit de corps of the regiment provides an emotional substitute for the sense of public approval that an army receives at home. This is particularly relevant to British experience during the days of the
empire An empire is a "political unit" made up of several territories and peoples, "usually created by conquest, and divided between a dominant center and subordinate peripheries". The center of the empire (sometimes referred to as the metropole) ex ...
, where the army was virtually continuously engaged in low-intensity conflict with insurgents, and full-scale warfare was the exception rather than the rule. A regimental system, since it is decentralized and the regiments are independent from each other, prevents the army from staging a
coup d'état A coup d'état (; French for 'stroke of state'), also known as a coup or overthrow, is a seizure and removal of a government and its powers. Typically, it is an illegal seizure of power by a political faction, politician, cult, rebel group, m ...
. This is best exemplified by the British Army: since the formation of the United Kingdom, there have been no military takeovers. A regimental system can also foster close links between the regiment and the community from which it is recruited. This sense of community 'ownership' over local regiments can be seen in the public outcry over recent regimental amalgamations in the United Kingdom. On the other hand, recruitment from a single community can lead to a concentrated and potentially devastating local impact if the regiment takes heavy casualties. Further, the regimental system offers the advantage of grouping like units together for centralized administrative, training, and logistical purposes, thereby creating an "
economies of scale In microeconomics, economies of scale are the cost advantages that enterprises obtain due to their scale of operation, and are typically measured by the amount of output produced per unit of time. A decrease in cost per unit of output enables ...
" effect and its ensuing increased efficiency. An illustrative example of this is the modular integration employed by the
United States Marine Corps The United States Marine Corps (USMC), also referred to as the United States Marines, is the maritime land force service branch of the United States Armed Forces responsible for conducting expeditionary and amphibious operations through combi ...
, which can take elements from its regimentally grouped forces and specifically tailor
combined arms Combined arms is an approach to warfare War is an intense armed conflict between states, governments, societies, or paramilitary groups such as mercenaries, insurgents, and militias. It is generally characterized by extreme vio ...
task forces for a particular mission or the deployed
Marine Expeditionary Unit A Marine expeditionary unit (MEU, pronounced as one syllable "" IPA: ) is the smallest air-ground task force (MAGTF) in the United States Fleet Marine Force.Marines Marines, or naval infantry, are typically a military force trained to operate in littoral zones in support of naval operations. Historically, tasks undertaken by marines have included helping maintain discipline and order aboard the ship (refle ...
mission adaptability, flexibility, philosophy, shared culture, history and overall esprit de corps, which allows for near seamless interoperability.


Commonwealth armies

In the
British Army The British Army is the principal land warfare force of the United Kingdom, a part of the British Armed Forces along with the Royal Navy and the Royal Air Force. , the British Army comprises 79,380 regular full-time personnel, 4,090 Gurk ...
and armies modelled on it (such as the
Australian Australian(s) may refer to: Australia * Australia, a country * Australians, citizens of the Commonwealth of Australia ** European Australians ** Anglo-Celtic Australians, Australians descended principally from British colonists ** Aboriginal Au ...
, the
New Zealand New Zealand ( mi, Aotearoa ) is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and over 700 smaller islands. It is the sixth-largest island count ...
, the
Canadian Canadians (french: Canadiens) are people identified with the country of Canada. This connection may be residential, legal, historical or cultural. For most Canadians, many (or all) of these connections exist and are collectively the source of ...
, the Pakistani and the
Indian Indian or Indians may refer to: Peoples South Asia * Indian people, people of Indian nationality, or people who have an Indian ancestor ** Non-resident Indian, a citizen of India who has temporarily emigrated to another country * South Asia ...
), the term ''regiment'' is used confusingly in two different ways: it can mean an administrative identity and grouping, or a tactical unit. In the former
Dominion of Newfoundland Newfoundland was a British dominion in eastern North America, today the modern Canadian province of Newfoundland and Labrador. It was established on 26 September 1907, and confirmed by the Balfour Declaration of 1926 and the Statute of Westmi ...
, "Regiment" was used to describe the entirety of the fighting armed forces, the
Royal Newfoundland Regiment The Royal Newfoundland Regiment (R NFLD R) is a Primary Reserve infantry regiment of the Canadian Army. It is part of the 5th Canadian Division's 37 Canadian Brigade Group. Predecessor units trace their origins to 1795, and since 1949 Royal N ...
. In the Commonwealth countries listed above, the large administrative regiment has been the normal practice for many years. In the case of India, "large regiments" of four to five battalions date from 1923 and, since the 1950s, many of these have expanded even further. As an example, the
Punjab Regiment Punjab Regiment may refer to the following existing units: *Punjab Regiment (India) *Punjab Regiment (Pakistan) From 1922 to 1947, the British Indian Army included 6 numbered Punjab Regiments: *1st Punjab Regiment * 2nd Punjab Regiment *8th Punj ...
of the Indian Army has expanded from four battalions in 1956 to its present strength of 20, while, in the
Pakistan Army The Pakistan Army (, ) is the Army, land service branch of the Pakistan Armed Forces. The roots of its modern existence trace back to the British Indian Army that ceased to exist following the partition of India, Partition of British India, wh ...
, several regiments have over 50 battalions. In Canada, the regiment is a formation of one or more units; existing almost exclusively for reasons of heritage, the continuance of
battle honor A battle honour is an award of a right by a government or sovereign to a military unit to emblazon the name of a battle or operation on its flags ("colours"), uniforms or other accessories where ornamentation is possible. In European military ...
s and ''esprit de corps''. The three regular force infantry regiments each consist of three regular force battalions of approximately 600 soldiers, in addition to one or more reserve battalions. Canadian battalions are employed tactically and administratively within
brigade group Brigade Enterprises Limited is a real estate and property development company that is based in Bengaluru, Karnataka, India. The Brigade Group also has operations in Mangalore, Mysore, Chennai, Kochi, Hyderabad, Chikmagalur, Ahmedabad and a repr ...
s. In Australia, there is but one administrative infantry regiment in the regular army: the
Royal Australian Regiment The Royal Australian Regiment (RAR) is the parent administrative regiment for regular infantry battalions of the Australian Army and is the senior infantry regiment of the Royal Australian Infantry Corps. It was originally formed in 1948 as a t ...
, consisting of all seven regular infantry battalions in the Army. The
Australian Army Reserve The Australian Army Reserve is a collective name given to the reserve units of the Australian Army. Since the Federation of Australia in 1901, the reserve military force has been known by many names, including the Citizens Forces, the Citizen ...
also has state-based infantry regiments which administer the reserve infantry battalions. In Pakistan, the word regiment is an administrative grouping. While individual battalions may have different roles (for example different battalions of the
Frontier Force Regiment The Frontier Force Regiment is one of the six infantry regiments of the Pakistan Army. They are popularly known as the ''Piffers'' in reference to their military history as the PIF ( Punjab Irregular Force) of the British Indian Army, or as th ...
may be mechanized infantry, paratroop infantry, or mountain troops), the regiment is considered to encompass all of them.


British Army

The modern British regimental system came about as a result of the 19th century
Cardwell Reforms The Cardwell Reforms were a series of reforms of the British Army undertaken by Secretary of State for War Edward Cardwell between 1868 and 1874 with the support of Liberal prime minister William Ewart Gladstone. Gladstone paid little attention ...
. In the
British Army The British Army is the principal land warfare force of the United Kingdom, a part of the British Armed Forces along with the Royal Navy and the Royal Air Force. , the British Army comprises 79,380 regular full-time personnel, 4,090 Gurk ...
, for most purposes, the regiment is the largest "permanent" organisational unit. Above regimental level, the organisation is changed to meet the tasks at hand. Because of their permanent nature, many regiments have long histories, often going back for centuries: the oldest British regiment still in existence is the
Royal Jersey Militia Formed in 1337, the Royal Militia of the Island of Jersey can claim to be the oldest sub-unit of the British Army, although, because it is not a regiment, and was disbanded for decades in the late 20th century, it is not the most senior. History ...
, established in 1337 although historically the Jersey Militia are referred to as a regiment it is disputed that they are in fact a corps. The
Buffs (Royal East Kent Regiment) The Buffs (Royal East Kent Regiment), formerly the 3rd Regiment of Foot, was a line infantry regiment of the British Army traditionally raised in the English county of Kent and garrisoned at Canterbury. It had a history dating back to 1572 and ...
, formed in 1572, was the oldest
infantry Infantry is a military specialization which engages in ground combat on foot. Infantry generally consists of light infantry, mountain infantry, motorized infantry & mechanized infantry, airborne infantry, air assault infantry, and marine i ...
regiment. It now forms part of the
Princess of Wales Royal Regiment The Princess of Wales's Royal Regiment (or PWRR, also known as 'The Tigers') is the senior English line infantry regiment of the British Army, second in the line infantry order of precedence to the Royal Regiment of Scotland and part of the Q ...
. In the United Kingdom, there existed until recently a number of administrative "divisions" in the infantry that encompassed several regiments, such as the Guards Division, the former Scottish Division (now a single regiment), or the Light Division (now also compressed into a multi-battalion single regiment). The reduction and consolidation of British infantry regiments that began in the late 1950s and concluded in 2006 has resulted in a system of administrative regiments each with several battalions, a band, a common badge and uniform etc. In the British regimental system, the tactical regiment or battalion is the basic functional unit and its commanding officer more autonomous than in continental systems. Divisional and brigade commanders generally do not immerse themselves in the day-to-day functioning of a battalion – they can replace the commanding officer but will not micro-manage the unit. The
regimental sergeant major Regimental sergeant major (RSM) is an appointment that may be held by warrant officers class 1 (WO1) in the British Army, the British Royal Marines and in the armies of many other Commonwealth and former Commonwealth nations, including Australi ...
is another key figure, responsible to the CO for unit discipline and the behaviour of the NCOs. It should, however, be noted that amalgamations beginning in the late 1950s and ending in 2006 have diluted the British regimental system through the now almost universal adoption of "large regiments" for the infantry of the Army. As of 2014, only thirteen line infantry regiments survive, each comprising up to six of the former battalions that previously had separate regimental status. Only the five Guards regiments retain their historic separate identities. Similarly, as of 2015, only eight of the regiments of the Royal Armoured Corps (cavalry plus Royal Tank Regiments) survive.


Armour

Armoured Armour (British English) or armor (American English; see spelling differences) is a covering used to protect an object, individual, or vehicle from physical injury or damage, especially direct contact weapons or projectiles during combat, or fr ...
regiments in Canada since the end of the
Second World War World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...
have usually consisted of a single tactical regiment. During the 1960s, three Canadian regiments had both regular and militia components, which were disbanded shortly after unification in 1968. Currently, one regiment is organised with two tactical regiments, 12e Régiment blindé du Canada and 12e Régiment blindé du Canada (Milice) are both part of the administrative regiment 12e Régiment blindé du Canada. One administrative armoured regiment of the
British Army The British Army is the principal land warfare force of the United Kingdom, a part of the British Armed Forces along with the Royal Navy and the Royal Air Force. , the British Army comprises 79,380 regular full-time personnel, 4,090 Gurk ...
consisted of more than one tactical regiment. The
Royal Tank Regiment The Royal Tank Regiment (RTR) is the oldest tank unit in the world, being formed by the British Army in 1916 during the First World War. Today, it is the armoured regiment of the British Army's 12th Armoured Infantry Brigade. Formerly known as th ...
until 2014 had two (1 and 2 RTR), and once had many more. They were all amalgamated into a single regiment.


Artillery

All of a nation's
artillery Artillery is a class of heavy military ranged weapons that launch munitions far beyond the range and power of infantry firearms. Early artillery development focused on the ability to breach defensive walls and fortifications during siege ...
units are considered part of a single administrative regiment, but there are typically several tactical artillery regiments. They are designated by numbers, names or both. For example, the tactical regiments 1st Regiment,
Royal Canadian Horse Artillery The Royal Canadian Horse Artillery is the name given to the regular field artillery units of the Canadian Army. Organization The Regular Force has three RCHA regiments: ; 1st Regiment, Royal Canadian Horse Artillery: this is the descendant of ...
, 7th Toronto Regiment, RCA and many others are part of the single administrative regiment The
Royal Regiment of Canadian Artillery , colors = The guns of the RCA themselves , colors_label = Colours , march = * Slow march: "Royal Artillery Slow March" * Quick march (dismounted parades): "British Grenadiers/ The ...
. In Britain, the
Royal Regiment of Artillery The Royal Regiment of Artillery, commonly referred to as the Royal Artillery (RA) and colloquially known as "The Gunners", is one of two regiments that make up the artillery arm of the British Army. The Royal Regiment of Artillery comprises t ...
works in the same way.


Infantry

Administrative
infantry Infantry is a military specialization which engages in ground combat on foot. Infantry generally consists of light infantry, mountain infantry, motorized infantry & mechanized infantry, airborne infantry, air assault infantry, and marine i ...
regiments are composed of one or more
battalion A battalion is a military unit, typically consisting of 300 to 1,200 soldiers commanded by a lieutenant colonel, and subdivided into a number of companies (usually each commanded by a major or a captain). In some countries, battalions are ...
s. When a regiment has only one battalion, the battalion may have exactly the same name as the regiment. For example, The
North Saskatchewan Regiment , garrison = Saskatoon, Saskatchewan, and Prince Albert, Saskatchewan , battles = North-West RebellionFirst World WarSecond World WarWar in Afghanistan , battle_honours = See #Battle hon ...
is the only battalion in the administrative regiment of the same name. When there is more than one battalion, they are distinguished by numbers, subsidiary titles or both. In Britain, every infantry battalion bears a number, even if it is the only remaining battalion in the regiment (in that case it is the 1st Battalion, with the exception of
The Irish Regiment of Canada , colors = , identification_symbol = Caubeen , identification_symbol_label = Headdress , identification_symbol_2 = O'Saffron , identification_symbol_2_label = Tartan , identification_symbol_4 = , ...
, which has a 2nd Battalion only). Until after the
Second World War World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...
, every regiment had at least two battalions. Traditionally, the regular battalions were the 1st and 2nd Battalions, the
militia A militia () is generally an army or some other fighting organization of non-professional soldiers, citizens of a country, or subjects of a state, who may perform military service during a time of need, as opposed to a professional force of r ...
(later Special Reserve) battalion was the 3rd Battalion, and the
Army Reserve A military reserve force is a military organization whose members have military and civilian occupations. They are not normally kept under arms, and their main role is to be available when their military requires additional manpower. Reserve ...
battalions were the 4th Battalion, the 5th Battalion and up. A few regiments had up to four regular battalions and more than one militia battalion, which disrupted the numbering, but this was rare. For this reason, although the regular battalion today (if there is only one) will always be the 1st Battalion, the TA battalions may have non-consecutive numbers. In practice, it is impossible to exercise all the administrative functions of a true regiment when the regiment consists of a single unit. Soldiers, and particularly officers, cannot spend a full career in one battalion. Thus in the Armoured Corps, the traditional administrative "regiment" tends to play more of a ceremonial role, while in practice, its members are administered by their corps or "branch" as in the Artillery. Thus soldiers and officers can serve in many different "regiments", changing hat badges without too much concern during their career. Indeed, in the artillery, all regiments wear the same badge.


Corps

The
British Army The British Army is the principal land warfare force of the United Kingdom, a part of the British Armed Forces along with the Royal Navy and the Royal Air Force. , the British Army comprises 79,380 regular full-time personnel, 4,090 Gurk ...
also has battalion-sized tactical regiments of the
Royal Engineers The Corps of Royal Engineers, usually called the Royal Engineers (RE), and commonly known as the ''Sappers'', is a corps of the British Army. It provides military engineering and other technical support to the British Armed Forces and is heade ...
,
Royal Corps of Signals The Royal Corps of Signals (often simply known as the Royal Signals – abbreviated to R SIGNALS or R SIGS) is one of the combat support arms of the British Army. Signals units are among the first into action, providing the battlefield communi ...
,
Army Air Corps Army Air Corps may refer to the following army aviation corps: * Army Air Corps (United Kingdom), the army aviation element of the British Army * Philippine Army Air Corps (1935–1941) * United States Army Air Corps (1926–1942), or its p ...
,
Royal Logistic Corps The Royal Logistic Corps provides logistic support functions to the British Army. It is the largest Corps in the Army. History The Royal Logistic Corps (RLC) was formed on 5 April 1993, by the union of five British Army corps: * Royal Engine ...
, and
Royal Military Police The Royal Military Police (RMP) is the corps of the British Army responsible for the policing of army service personnel, and for providing a military police presence both in the UK and while service personnel are deployed overseas on operation ...
.


Indian Army

Upon its inception, the
Indian Army The Indian Army is the land-based branch and the largest component of the Indian Armed Forces. The President of India is the Supreme Commander of the Indian Army, and its professional head is the Chief of Army Staff (COAS), who is a four- ...
inherited the British Army's organisational structure, which is still maintained today. Therefore, like its predecessor, an Indian infantry regiment's responsibility is not to undertake field operations but to provide battalions and well-trained personnel to the field formations. As such, it is common to find battalions of the same regiment spread across several brigades, divisions, corps, commands, and even theatres. Like its British and Commonwealth counterparts, troops enlisted within the regiment are immensely loyal, take great pride in the regiment to which they are assigned, and generally spend their entire career within the regiment. Most Indian Army infantry regiments recruit based on certain selection criteria, such as region (for example, the
Assam Regiment The Assam Regiment is an infantry regiment of the Indian Army. The regiment consists of 25 battalions: 15 regular battalions, 3 Rashtriya Rifles battalions, 5 Territorial Army battalions (including 2 ecological battalions). It recruits exclusiv ...
), caste/community (
Jat Regiment The Jat Regiment is an infantry regiment of the Indian Army, of which it is one of the longest-serving regiments.Sikh Regiment The Sikh Regiment is an infantry regiment of the Indian Army. Sikh regiment is the highest decorated regiment of the Indian Army and in 1979, the 1st battalion was the Commonwealth's most decorated battalion with 245 pre-independence and 82 ...
). Most regiments continue the heritage of regiments raised under the British Raj, but some have been raised after independence, some of which have specialised in border defence, in particular the
Ladakh Scouts The Ladakh Scouts is an infantry regiment of the Indian Army, nicknamed the "Snow Warriors" or "Snow Leopards". The regiment specialises in mountain warfare, and its primary role is to guard India's borders in the high altitudes of the Union ...
, the
Arunachal Scouts The Arunachal Scouts is an infantry regiment of Indian army based in Arunachal Pradesh. Specialising in mountain warfare the regiment was established with the purpose of defending the Indian-Chinese border in Arunachal Pradesh. A large proportion ...
, and the
Sikkim Scouts The Sikkim Scouts is a regiment of the Indian Army based in and recruited from the state of Sikkim. Raised in 2013 and made operational in 2015, it is the youngest Indian Army regiment. The regiment was formed along the lines of the Ladakh Scout ...
. Over the years there have been fears that troops' allegiance lay more with their regiments and the regions/castes/communities/religions from which they were recruited, as opposed to the Indian union as a whole. Thus some "all India" or "all class" regiments have been created, which recruit troops from all over India, regardless of region, caste, community, or religion: such as the
Brigade of the Guards The Brigade of The Guards is a mechanised infantry regiment of the Indian Army. It was raised as the first "all India", "all class" infantry unit of the Army where troops from all parts of India serve together, as opposed to other regiments that ...
(which later converted to the mechanised infantry profile) and the Parachute Regiment. The Indian Army has many regiments, majority of them infantry, with single-battalion cavalry and artillery regiments. These are a legacy of the British Indian army during the years when the British ruled India before 15 August 1947. Each infantry regiment may have one or more battalions, while cavalry, armour and artillery regiments are single-battalion formations. There are regimental headquarters (called as a centre) for each regiment. Each regiment of infantry is commanded by a colonel and assisted by a lieutenant colonel.


Irish Army

The
Irish Army The Irish Army, known simply as the Army ( ga, an tArm), is the land component of the Defence Forces of Ireland.The Defence Forces are made up of the Permanent Defence Forces – the standing branches – and the Reserve Defence Forces. The Ar ...
field artillery units are called regiments. They are divided into batteries and together the regiments form the Artillery Corps. Air Defence units are organised as a single regiment with individual batteries stationed around the country.


Philippine Army

The
Philippine Army The Philippine Army (PA) ( Tagalog: ''Hukbong Katihan ng Pilipinas''; in literal English: ''Army of the Ground of the Philippines''; in literal Spanish: ''Ejército de la Tierra de la Filipinas'') is the main, oldest and largest branch of the ...
currently has 3 regiments dedicated to special operations under the
AFP Special Operations Command AFP most often refers to: * Agence France-Presse, an international news agency * Australian Federal Police AFP or afp may also refer to: Media * Advertiser-funded programming, a television funding model *American Family Publishers, a magazin ...
. They specialized in direct action, jungle warfare, urban warfare, special reconnaissance, unconventional warfare, psychological warfare, counter-terrorism, mass base and sniping operations against hostile positions depending on the situation of a certain place.


Scout Rangers

The Scout Rangers, known officially as the First Scout Ranger Regiment, specializes in anti-guerrilla jungle warfare, raids, ambushes, close quarters combat, urban warfare and sabotage. It was formed on November 25, 1950, under the command of former AFP Vice Chief of Staff and Defense Secretary Rafael M. Ileto. It was modelled after two legendary fighting groups, the intelligence gathering American
Alamo Scouts The Alamo Scouts (U.S. 6th Army Special Reconnaissance Unit) was a reconnaissance unit of the Sixth United States Army in the Pacific Theater of Operations during World War II. The unit is best known for its role in liberating American prisoner ...
and the combat ready
US Army Rangers United States Army Rangers, according to the US Army's definition, are personnel, past or present, in any unit that has the official designation "Ranger". The term is commonly used to include graduates of the US Army Ranger School, even if t ...
. It was also formed to combat insurgencies such as the Communist and Moro Rebellions. It currently have more than 2500 Members.


Special Forces

The Special Forces Regiment (Airborne) is a special forces unit of the Philippine Army. It is based on and continually trains with its American counterpart, the U.S. Army Special Forces (Green Berets). It was established in 1962 by then Captain
Fidel V. Ramos Fidel Valdez Ramos (, ; March 18, 1928 – July 31, 2022), popularly known as FVR and Eddie Ramos, was a Filipino general and politician who served as the 12th president of the Philippines from 1992 to 1998. He was the only career military ...
PA (INF) (first commanding officer of the SFR-A), primarily trained in both unconventional warfare operations and psychological warfare operations. Like the Scout Rangers, members of the Special Forces Regiment of the Philippine Army are also highly trained in counter-insurgency operations. Upon assignment to the Special Forces, soldiers are made to undergo the Basic Airborne Course. They, later-on, undergo the Special Forces Operations Course - an eight-month course that equips each SF soldier in the basics of Special Forces and unconventional warfare operations. Each member of the SF Regiment may opt to undergo specialty courses as well after finishing the Special Forces basic course. These include, but is not limited to, training in demolitions and bomb disposal (EOD), psychological warfare operations (PSYOPS), riverine operations including combat diving, intelligence operations, weapons, medics, as well as VIP security training in preparation for reassignment with the Presidential Security Group. The basic combat organization of the Special Forces is the 12-man Special Forces Team. An SF Team will have at least one of each SF MOS present in the team.


Light Reaction Regiment

The Light Reaction Regiment is the premier counter-terrorist unit of the Philippine Army. It was formerly known as the Light Reaction Battalion and Light Reaction Company. Due to its specialization in counter-terrorism operations and its formation with the assistance of American advisers, the Light Reaction Regiment has been sometimes referred to as the Philippines'
Delta Force The 1st Special Forces Operational Detachment–Delta (1st SFOD-D), referred to variously as Delta Force, Combat Applications Group (CAG), Army Compartmented Elements (ACE), "The Unit", or within Joint Special Operations Command (JSOC), Task Fo ...
. It traces its origins back to the year 2000 when non-commissioned officers from the Scout Rangers and 1st Special Forces Regiment (Airborne) were trained by American military advisers from the 1st Battalion,
1st Special Forces Group The 1st Special Forces Group (Airborne) (1st SFG) (A) is a unit of the U.S. Army Special Forces operating under the United States Pacific Command. It is designed to deploy and execute nine doctrinal missions throughout the Indo-Pacific Command a ...
.


Russian/Soviet Armed Forces

The regiments (russian: полк) of the
Russian Army The Russian Ground Forces (russian: Сухопутные войска В Sukhoputnyye voyska V, also known as the Russian Army (, ), are the Army, land forces of the Russian Armed Forces. The primary responsibilities of the Russian Gro ...
and armed forces influenced by Russia consist of
battalion A battalion is a military unit, typically consisting of 300 to 1,200 soldiers commanded by a lieutenant colonel, and subdivided into a number of companies (usually each commanded by a major or a captain). In some countries, battalions are ...
s (russian: link=no, батальон), in the
infantry Infantry is a military specialization which engages in ground combat on foot. Infantry generally consists of light infantry, mountain infantry, motorized infantry & mechanized infantry, airborne infantry, air assault infantry, and marine i ...
or
tank A tank is an armoured fighting vehicle intended as a primary offensive weapon in front-line ground combat. Tank designs are a balance of heavy firepower, strong armour, and good battlefield mobility provided by tracks and a powerful engin ...
troops, (russian: link=no, дивизион) in the artillery troops, and squadrons (russian: link=no, эскадрилья) in
aviation Aviation includes the activities surrounding mechanical flight and the aircraft industry. ''Aircraft'' includes fixed-wing and rotary-wing types, morphable wings, wing-less lifting bodies, as well as lighter-than-air craft such as hot air ...
troops. Land forces regiments are subdivided into
companies A company, abbreviated as co., is a legal entity representing an association of people, whether natural, legal or a mixture of both, with a specific objective. Company members share a common purpose and unite to achieve specific, declared go ...
(russian: link=no, рота) (or batteries in the artillery) and
platoon A platoon is a military unit typically composed of two or more squads, sections, or patrols. Platoon organization varies depending on the country and the branch, but a platoon can be composed of 50 people, although specific platoons may range ...
s (russian: link=no, взвод). These also include many support units of either company or platoon size. On the march, a regiment normally travels in
column A column or pillar in architecture and structural engineering is a structural element that transmits, through compression, the weight of the structure above to other structural elements below. In other words, a column is a compression member. ...
along one or two routes, averaging 20–30 km/h when moving on roads or 15 km/h going cross-country. The main force is preceded by reconnaissance and advanced guards and protected on the flanks and the rear by security elements. When offensive operations begin, a regiment normally assumes attack formation about 1,000 metres from the enemy's position and attacks along a
front Front may refer to: Arts, entertainment, and media Films * ''The Front'' (1943 film), a 1943 Soviet drama film * ''The Front'', 1976 film Music * The Front (band), an American rock band signed to Columbia Records and active in the 1980s and e ...
typically 4 to 5 kilometres wide, but can vary between 3 and 8 kilometres. During the attack the average speed of advance is 200 metres per minute with
BTR BTR may refer to: Companies * BTR Aerospace Group * BTR plc, formerly BTR Industries, one of the predecessor companies of Invensys plc * British Thomson-Houston (former name BTR), a British engineering and heavy industrial company Media, music, ...
s or BMPs normally following 100 to 400 metres behind tanks and 50 to 100 metres of spacing between vehicles.


Motor Rifle Regiment

The Motor Rifle Regiment was one of the basic tactical units within the
Soviet Ground Forces uk, Радянська армія , image = File:Communist star with golden border and red rims.svg , alt = , caption = Emblem of the Soviet Army , start_date ...
, totaling around 2,500 officers and other ranks. While normally operating as part of a Motor Rifle Division or
Tank Division A tank is an armoured fighting vehicle intended as a primary offensive weapon in front-line ground combat. Tank designs are a balance of heavy firepower, strong armour, and good battlefield mobility provided by tracks and a powerful engi ...
, it was capable of short-term independent operations. By the late 1980s, it consisted of a regimental headquarters in command of three Motor Rifle Battalions, each numbering around five hundred personnel and equipped with either BMP
infantry fighting vehicle An infantry fighting vehicle (IFV), also known as a mechanized infantry combat vehicle (MICV), is a type of armoured fighting vehicle used to carry infantry into battle and provide direct-fire support. The 1990 Treaty on Conventional Armed Forc ...
s or
BTR BTR may refer to: Companies * BTR Aerospace Group * BTR plc, formerly BTR Industries, one of the predecessor companies of Invensys plc * British Thomson-Houston (former name BTR), a British engineering and heavy industrial company Media, music, ...
armoured personnel carrier An armoured personnel carrier (APC) is a broad type of armoured military vehicle designed to transport personnel and equipment in combat zones. Since World War I, APCs have become a very common piece of military equipment around the world. Acc ...
s, and one Tank Battalion, typically consisting of thirty-one
T-64 The T-64 is a Soviet tank manufactured in Kharkiv, and designed by Kharkiv Morozov Machine Building Design Bureau. The tank was introduced in the early 1960s. It was a more advanced counterpart to the T-62: the T-64 served in tank divisions, while ...
,
T-72 The T-72 is a family of Soviet/Russian main battle tanks that entered production in 1969. The T-72 was a development of the T-64, which was troubled by high costs and its reliance on immature developmental technology. About 25,000 T-72 tanks ha ...
or
T-80 The T-80 is a main battle tank (MBT) that was designed and manufactured in the former Soviet Union and manufactured in Russia. The T-80 is based on the T-64, while incorporating features from the later T-72. The chief designer of the T-80 was So ...
tanks, although older models were present in units outside the
European theater The European theatre of World War II was one of the two main theatres of combat during World War II. It saw heavy fighting across Europe for almost six years, starting with Germany's invasion of Poland on 1 September 1939 and ending with the ...
. These were supported by a battalion of eighteen 122mm artillery pieces, either the self-propelled
2S1 Gvozdika The 2S1 ''Gvozdika'' (russian: link=no, 2С1 «Гвоздика», "Carnation") is a Soviet self-propelled howitzer based on the MT-LBu multi-purpose chassis, mounting a 122 mm 2A18 howitzer. "2S1" is its GRAU designation. An alternative Rus ...
in BMP regiments or towed D-30
howitzer A howitzer () is a long- ranged weapon, falling between a cannon (also known as an artillery gun in the United States), which fires shells at flat trajectories, and a mortar, which fires at high angles of ascent and descent. Howitzers, like ot ...
s in BTR regiments, though some BTR regiments also used the 2S1, with additional fire support from the organic mortar battery in each infantry battalion. Additional combat support came in the form of an air defence missile and artillery company with four
SA-9 The 9K31 ''Strela-1'' (russian: 9К31 «Стрела-1»; en, arrow) is a highly mobile, short-range, low altitude infra-red guided surface-to-air missile system. Originally developed by the Soviet Union under the GRAU designation 9K31, it i ...
or SA-13s and four
ZSU-23-4 The ZSU-23-4 "Shilka" is a lightly armored Soviet self-propelled, radar-guided anti-aircraft weapon system (SPAAG). Etymology The acronym "ZSU" stands for ''Zenitnaya Samokhodnaya Ustanovka'' (russian: Зенитная Самоходная Ус ...
or
2S6 Tunguska The 2K22 Tunguska (russian: 2К22 "Тунгуска") is a Soviet and now Russian tracked self-propelled anti-aircraft weapon armed with a surface-to-air gun and missile system. It is designed to provide day and night protection for infantry and ...
s, an antitank missile battery with nine
BRDM BRDM is an initialism for ''Boyevaya Razvedyvatelnaya Dozornaya Mashina'', (RU Боевая Разведывательная Дозорная Машина), literally "Combat Reconnaissance Patrol Vehicle". The BRDM is a four-wheeled amphibious ve ...
-mounted
AT-3 Sagger The 9M14 Malyutka (russian: Малютка, links=no; "Little one", NATO reporting name: AT-3 Sagger) is a manual command to line of sight (MCLOS) wire-guided anti-tank guided missile (ATGM) system developed in the Soviet Union. It was the firs ...
or
AT-5 Spandrel The 9M113 ''Konkurs'' (russian: 9М113 «Конкурс»; en, "Contest"; NATO reporting name AT-5 ''Spandrel'') is a Soviet SACLOS wire-guided anti-tank missile. A development of the 9K111 Fagot with greater firepower, the 9M113 Konkurs can ...
launchers, a reconnaissance company mounted on BMPs, BRDMs and motorbikes and an engineer company. Other non-combat formations included a signals company, chemical protection platoon, material support company, maintenance company, and regimental medical point.


Tank Regiment

The Tank Regiment was found in both Motorised Rifle Divisions and Tank Divisions, with slight organisational differences depending between the two. By the late 1980s, Tank Regiments operating as part of Motorised Rifle Divisions contained slightly over 1,100 officers and other ranks while those operating within Tank Divisions contained over 1,600. A regimental headquarters oversaw command of three Tank Battalions of thirty-one tanks each, typically
T-64 The T-64 is a Soviet tank manufactured in Kharkiv, and designed by Kharkiv Morozov Machine Building Design Bureau. The tank was introduced in the early 1960s. It was a more advanced counterpart to the T-62: the T-64 served in tank divisions, while ...
,
T-72 The T-72 is a family of Soviet/Russian main battle tanks that entered production in 1969. The T-72 was a development of the T-64, which was troubled by high costs and its reliance on immature developmental technology. About 25,000 T-72 tanks ha ...
, or
T-80 The T-80 is a main battle tank (MBT) that was designed and manufactured in the former Soviet Union and manufactured in Russia. The T-80 is based on the T-64, while incorporating features from the later T-72. The chief designer of the T-80 was So ...
tanks although some units used older models, and an artillery battalion of eighteen
2S1 Gvozdika The 2S1 ''Gvozdika'' (russian: link=no, 2С1 «Гвоздика», "Carnation") is a Soviet self-propelled howitzer based on the MT-LBu multi-purpose chassis, mounting a 122 mm 2A18 howitzer. "2S1" is its GRAU designation. An alternative Rus ...
self-propelled howitzers, with some using the older towed D-30 howitzer. Tank Regiments operating as part of a Tank Division included a fifth combat battalion of motorised infantry, identical to those in BMP-equipped Motorised Rifle Regiments. Combat support and combat service support subunits were the same as in Motorised Rifle Regiments with the exception of the antitank missile battery.


Artillery Regiment

The Artillery Regiment was used to provide fire support, but differed depending on whether it was part of a Motorised Rifle Division or
Tank Division A tank is an armoured fighting vehicle intended as a primary offensive weapon in front-line ground combat. Tank designs are a balance of heavy firepower, strong armour, and good battlefield mobility provided by tracks and a powerful engi ...
. The artillery regiment of an MRD consisted of three battalions of eighteen
2S3 Akatsiya The SO-152 (Russian: СО-152) is a Soviet 152.4 mm self-propelled gun developed in 1968, as a response to the American 155 mm M109 howitzer. Development began in 1967, according to the Resolution of the Council of Ministers of the Sovie ...
s each and a battalion of eighteen
BM-21 Grad The BM-21 "Grad" (russian: БМ-21 "Град", lit= hail) is a self-propelled 122 mm multiple rocket launcher designed in the Soviet Union. The system and the M-21OF rocket were first developed in the early 1960s, and saw their first comba ...
s, numbering just under 1,300 personnel total, while a TD artillery regiment had one less battalion of 2S3s and a little over one thousand personnel total. This was the standard model by the late 1980s, however not all artillery regiments had yet to conformed to it and one or more of the battalions might have used older weapon systems like the D-30 howitzer. Each regiment was led by a command control battery and included an artillery reconnaissance battery, motor transport company, maintenance company, regimental medical point, chemical protection platoon and supply and service platoon.


Anti-Aircraft Rocket Regiment

An Anti-Aircraft Rocket Regiment was an important part of a motor rifle division or
Tank Division A tank is an armoured fighting vehicle intended as a primary offensive weapon in front-line ground combat. Tank designs are a balance of heavy firepower, strong armour, and good battlefield mobility provided by tracks and a powerful engi ...
's effort to envelop the battlefield in an extensive air defence network. Numbering a little over five hundred personnel total, the SAM regiment consisted of a regimental headquarters in charge of twenty
SA-6 Gainful The 2K12 ''"Kub"'' (russian: 2К12 "Куб"; en, cube) (NATO reporting name: SA-6 "Gainful") mobile surface-to-air missile system is a Soviet low to medium-level air defence system designed to protect ground forces from air attack. "2К12" is ...
s organised into five missile firing batteries; most were SA-6a platforms although since 1979 a limited number of SA-6bs were also deployed and some regiments used the
SA-8 Gecko The 9K33 ''Osa'' (, literally "wasp"; NATO reporting name SA-8 ''Gecko'') is a highly mobile, low-altitude, short-range tactical surface-to-air missile system developed in the Soviet Union in the 1960s and fielded in 1972. Its export version na ...
as an alternative. Each missile battery, along with the regimental headquarter and missile technical battery, were also equipped with three
MANPAD Man-portable air-defense systems (MANPADS or MPADS) are portable surface-to-air missiles. They are guided weapons and are a threat to low-flying aircraft, especially helicopters. Overview MANPADS were developed in the 1950s to provide military ...
s, either the
SA-7 Grail The 9K32 Strela-2 (russian: Cтрела, "arrow"; NATO reporting name SA-7 Grail) is a light-weight, shoulder-fired, surface-to-air missile (or MANPADS) system. It is designed to target aircraft at low altitudes with passive infrared homing guid ...
,
SA-14 Gremlin The 9K34 Strela-3 (russian: 9К34 «Стрела-3», 'arrow', NATO reporting name: SA-14 Gremlin) is a man-portable air defense missile system (MANPADS) developed in the Soviet Union as a response to the poor performance of the earlier 9K32 Str ...
or
SA-16 Gimlet The 9K38 Igla (russian: Игла́, "needle", NATO reporting name SA-18 Grouse) is a Russian/Soviet man-portable infrared homing surface-to-air missile (SAM) system. A simplified, earlier version is known as the 9K310 Igla-1 (NATO: SA-16 Gimle ...
. Besides the missile technical battery, other support subunits included an artillery reconnaissance battery, motor transport company, maintenance company and chemical protection platoon.


Antiaircraft Artillery Regiment

Antiaircraft artillery (AAA) regiments in the late 1980s took the place of SAM regiments in divisions which were assigned to rear areas. These were equipped with twenty-four
S-60 57mm Anti Aircraft Gun AZP S-60 (russian: Автоматическая зенитная пушка С-60, abbrev. АЗП (AZP); literally: ''Automatic anti-aircraft gun S-60'') is a Soviet towed, road-transportable, short- to medium-range, single-barrel anti-aircraft ...
s organised into four firing batteries. Each firing battery along with the regimental headquarters were also equipped with three
MANPAD Man-portable air-defense systems (MANPADS or MPADS) are portable surface-to-air missiles. They are guided weapons and are a threat to low-flying aircraft, especially helicopters. Overview MANPADS were developed in the 1950s to provide military ...
s, either the
SA-7 Grail The 9K32 Strela-2 (russian: Cтрела, "arrow"; NATO reporting name SA-7 Grail) is a light-weight, shoulder-fired, surface-to-air missile (or MANPADS) system. It is designed to target aircraft at low altitudes with passive infrared homing guid ...
,
SA-14 Gremlin The 9K34 Strela-3 (russian: 9К34 «Стрела-3», 'arrow', NATO reporting name: SA-14 Gremlin) is a man-portable air defense missile system (MANPADS) developed in the Soviet Union as a response to the poor performance of the earlier 9K32 Str ...
or
SA-16 Gimlet The 9K38 Igla (russian: Игла́, "needle", NATO reporting name SA-18 Grouse) is a Russian/Soviet man-portable infrared homing surface-to-air missile (SAM) system. A simplified, earlier version is known as the 9K310 Igla-1 (NATO: SA-16 Gimle ...
. Additional subunits include a command and control battery and service battery.


United States


United States Army

Historically, the
United States Army The United States Army (USA) is the land service branch of the United States Armed Forces. It is one of the eight U.S. uniformed services, and is designated as the Army of the United States in the U.S. Constitution.Article II, section 2, cla ...
was organized into regiments, except from 1792 to 1796 during the existence of the
Legion of the United States The Legion of the United States was a reorganization and extension of the Continental Army from 1792 to 1796 under the command of Major General Anthony Wayne. It represented a political shift in the new United States, which had recently adopte ...
. During this period the Army, or "Legion", was organized into four "sub-legions", 18th century forerunners of the modern combined arms brigade that combined infantry,
riflemen A rifleman is an infantry soldier armed with a rifled long gun. Although the rifleman role had its origin with 16th century hand cannoneers and 17th century musketeers, the term originated in the 18th century with the introduction of the rif ...
,
artillery Artillery is a class of heavy military ranged weapons that launch munitions far beyond the range and power of infantry firearms. Early artillery development focused on the ability to breach defensive walls and fortifications during siege ...
, and
cavalry Historically, cavalry (from the French word ''cavalerie'', itself derived from "cheval" meaning "horse") are soldiers or warriors who fight mounted on horseback. Cavalry were the most mobile of the combat arms, operating as light cavalry ...
. When combined with other regiments during wartime, for active field operations, regiments were further formed into
brigade A brigade is a major tactical military formation that typically comprises three to six battalions plus supporting elements. It is roughly equivalent to an enlarged or reinforced regiment. Two or more brigades may constitute a division. Br ...
s and divisions. From colonial times, the regiment consisted of a small regimental
headquarters Headquarters (commonly referred to as HQ) denotes the location where most, if not all, of the important functions of an organization are coordinated. In the United States, the corporate headquarters represents the entity at the center or the to ...
(regimental headquarters companies not existing before 1915) and in 1775 ten "line"
companies A company, abbreviated as co., is a legal entity representing an association of people, whether natural, legal or a mixture of both, with a specific objective. Company members share a common purpose and unite to achieve specific, declared go ...
, based on the British Army model, without any permanent intermediate level of organization, viz.,
battalion A battalion is a military unit, typically consisting of 300 to 1,200 soldiers commanded by a lieutenant colonel, and subdivided into a number of companies (usually each commanded by a major or a captain). In some countries, battalions are ...
headquarters organic to the regiment. From 1776 through 1783 American infantry regiments contained from as few as seven companies (e.g. South Carolina Rifles) to as many as twelve (Pennsylvania Rifles and Maryland State troops) with Continental Army infantry regiments having eight companies (increased to nine in 1781). (Briefly, from 1790 to 1792, regiments were organized into three battalions of four companies each.) Traditionally, the regiment and battalion were one and the same, with the "battalion" simply being the regiment organized for battle. During the Civil War, there were nine new United States regular army infantry regiments (11th though the 19th) added to the ten already existing. The old regiments (1st through 10th) were single-battalion, ten-company regiments, but the new regiments were authorized three battalions of eight companies each. However, only three of these nine regiments ever reached full strength of three battalions, with four others only achieving a manning level of two full battalions. Regiments were usually commanded by a colonel, assisted by a lieutenant colonel and a major, as well as additional staff officers and enlisted men in the regimental headquarters. Occasionally, a regimental commander would organize several companies into one, or rarely two, temporary organizations, called battalions, under command of the regiment's lieutenant colonel, major, or a senior captain. (A historic example of this arrangement is the 7th Cavalry Regiment during the
Battle of the Little Big Horn The Battle of the Little Bighorn, known to the Lakota and other Plains Indians as the Battle of the Greasy Grass, and also commonly referred to as Custer's Last Stand, was an armed engagement between combined forces of the Lakota Sioux, Nort ...
in 1876.) Many more additional regiments of the
United States Volunteers United States Volunteers also known as U.S. Volunteers, U.S. Volunteer Army, or other variations of these, were military volunteers called upon during wartime to assist the United States Army but who were separate from both the Regular Army and the ...
were recruited from each state during the
American Civil War The American Civil War (April 12, 1861 – May 26, 1865; also known by other names) was a civil war in the United States. It was fought between the Union ("the North") and the Confederacy ("the South"), the latter formed by states th ...
according to General Orders No. 15., War Department, Adjutant General's Office, Washington, May 4, 1861: In 1890, the number of companies in a regiment was reduced from the traditional ten to only eight, as the end of the Indian Wars became evident and troop reductions became in order. However, in 1898 as the war with Spain began, a three-battalion, 12-company structure was effected. This expanded regimental structure produced units, proportionally roughly the same approximate size as the single battalion, ten-company regiments of the Civil War. (For example: 101 officers and enlisted men per company, and a 36-member regimental headquarters, with 1,046 per typical Union Army infantry regiment in 1861, vs. 112 officers and enlisted men per company, and the same 36-member regimental headquarters, with 1,380 per regiment in a typical U.S. Army infantry regiment in 1898.) After the short war the Army reduced the size of companies, battalions, and regiments by about 30% under demobilization. However, the number of companies and battalions per regiment remained at 12 and three, respectively. Until 1917, under its traditional triangular organizational plan, infantry regiments were organized into brigades of three regiments, with three infantry brigades (for a total of nine infantry regiments), along with one brigade each of cavalry and field artillery constituting a division. In 1917 the Army adopted the
square division A square division is a designation given to the way military divisions are organized. In a square organization, the division's main body is composed of four "maneuver," i.e., infantry regimental elements. Other types of regiments, such as artillery, ...
organizational plan, which massively increased the size of units from the company through corps, more than tripling, or nearly quadrupling, the number of troops per unit. (From 1915 to 1917, the authorized strength of rifle companies increased from 76 officers and enlisted men to 256, and infantry regiments grew from 959 to 3,720.) The "square division" consisted of two infantry brigades of two infantry regiments each, with each regiment containing a regimental headquarters company, a machinegun company, a supply company, and 12 rifle companies organized into three battalions of four rifle companies each. (The single machine gun company reported directly to regimental headquarters.) The division also contained an artillery brigade of three regiments and three separate combat service support regiments: engineer, quartermaster, and medical. The Army reorganized in preparation for the Second World War by effecting its
triangular division A triangular division is a designation given to the way military divisions are organized. In a triangular organization, the division's main body is composed of three regimental maneuver elements. These regiments may be controlled by a brigade head ...
organizational structure in 1939. Under this plan, divisional brigades were eliminated and the division consisted of three infantry regiments and one artillery regiment, styled as "Division Artillery," but usually consisting of battalions of the same regiment. The infantry regiments still contained three battalions; there were now "headquarters and headquarters" companies (HHCs) not only at the regimental-level but in each battalion as well. The battalions still contained four "line" companies, but instead of four rifle companies, now had three rifle companies and a heavy weapons company (containing machine guns and mortars). The regiment's machine gun company was now an anti-tank company, the supply company became the service company, and a cannon company and a medical detachment were added to the regiment. In 1942 the Army began organizing armored divisions into
combat command A combat command was a combined-arms military organization of comparable size to a brigade or regiment employed by armored forces of the United States Army from 1942 until 1963. The structure of combat commands was task-organized and so the force ...
s, which grouped armor, armored infantry, and armored field artillery battalions into three tactical groups within the division without regard to regimental affiliation. However, armored regiment designations were retained for lineage and heraldic purposes. As the United States Army transformed after the Korean War for potential combat against a nuclear-armed Warsaw Pact, changes began in 1956 to transform infantry regiments into battle groups under its new
Pentomic Pentomic (cf. ''Greek pent(e)-'' +''-tome'' "of five parts") was a structure for infantry and airborne divisions adopted by the US Army between 1957 and 1963, in response to the potential use of tactical nuclear weapons, on future battlefields. ...
organization. Under this plan, battalions were eliminated and the infantry battle groups consisted of an
Headquarters and Headquarters Company In United States Army units, a Headquarters and Headquarters Company (HHC) is a company-sized military unit, found at the battalion level and higher. Considered one unit, a Headquarters and Headquarters Company is essentially two elements with ...
, five rifle companies, and a combat support company. This scheme retained the regimental designation for lineage and heraldry purposes, but the regiment ceased to exist as an intact organization for both infantry and field artillery units. The Divisional Artillery were now composed of several unrelated artillery battalions. By 1965, the Army had eliminated the regiment (replaced by the brigade) under the
Reorganization Objective Army Divisions The history of the United States Army began in 1775. From its formation, the United States Army has been the primary land based part of the United States Armed Forces. The Army's main responsibility has been in fighting land battles and military ...
(ROAD) plan as a tactical and administrative organization in all combat arms, save for a few armored cavalry regiments. However the battalion was restored as a tactical echelon, now organized into an HHC, three rifle companies, and a combat support company. The ROAD structure sealed the fate of the regiment in the U.S. Army, confirming its elimination as a level of command that had begun in 1942 with the "combat command" organization of the armored divisions and furthered by the Pentomic experiment in the 1950s. By 2015, the only Army unit still organized as a traditional regiment was the
75th Ranger Regiment The 75th Ranger Regiment, also known as Army Rangers, is the U.S. Army's premier light infantry unit and special operations force within the United States Army Special Operations Command. The regiment is headquartered at Fort Benning, Georgi ...
. In the 20th century, by using modern industrial management techniques, the Army was able to draft, assemble, equip, train and then employ huge masses of conscripted civilians in very short order, starting with minimal resources. Beginning with the First World War, as units became increasingly larger, and weapon systems and equipment became more complex, the regiment, while still filling a role as the immediate headquarters for its organic battalions, began to be replaced by the brigade as the intermediate tactical and operational headquarters for battalions, with the division becoming the senior administrative and logistical headquarters for the battalions, regiments, and brigades under its command. A new system, the
Combat Arms Regimental System The Combat Arms Regimental System (CARS), was the method of assigning unit designations to units of some of the combat arms branches of the United States Army, including Infantry, Special Forces, Field Artillery, and Armor, from 1957 to 1981. A ...
, or CARS, was adopted in 1957 to replace the old regimental system. CARS uses the Army's traditional regiments as parent organizations for historical purposes, but the primary building blocks are divisions,
brigade A brigade is a major tactical military formation that typically comprises three to six battalions plus supporting elements. It is roughly equivalent to an enlarged or reinforced regiment. Two or more brigades may constitute a division. Br ...
s, and
battalion A battalion is a military unit, typically consisting of 300 to 1,200 soldiers commanded by a lieutenant colonel, and subdivided into a number of companies (usually each commanded by a major or a captain). In some countries, battalions are ...
s. Each battalion carries an association with a
parent regiment The Combat Arms Regimental System (CARS), was the method of assigning unit designations to units of some of the combat arms branches of the United States Army, including Infantry, Special Forces, Field Artillery, and Armor, from 1957 to 1981. A ...
, even though the regimental organization no longer exists. In some brigades several numbered battalions carrying the same regimental association may still serve together, and tend to consider themselves part of the traditional regiment when in fact they are independent battalions serving a brigade, rather than a regimental, headquarters. The
United States Army Regimental System The United States Army Regimental System (USARS) is an organizational and classification system used by the United States Army. It was established in 1981 to replace the Combat Arms Regimental System (CARS) to provide each soldier with continu ...
(USARS) was established in 1981 to replace the Combat Arms Regimental System, to provide each soldier with continuous identification with a single regiment, and to support that concept with a personnel system that would increase a soldier's probability of serving recurring assignments with his or her regiment. The USARS was developed with the intention that it would enhance combat effectiveness by providing the opportunity for a regimental affiliation, thus obtaining some of the benefits of the traditional regimental system. There are exceptions to USARS regimental titles, including the
armored cavalry regiment An armored cavalry regiment (ACR) is a regiment of the United States Army (Active Component, or Reserve Component (Army Reserve or Army National Guard)) organized for the specific purposes of reconnaissance, surveillance, and security. The reg ...
s (now defunct) and the
75th Ranger Regiment The 75th Ranger Regiment, also known as Army Rangers, is the U.S. Army's premier light infantry unit and special operations force within the United States Army Special Operations Command. The regiment is headquartered at Fort Benning, Georgi ...
created in 1986. On 1 October 2005, the word "regiment" was formally appended to the name of all active and inactive CARS and USARS regiments. So, for example, the 1st Cavalry officially became titled the 1st Cavalry Regiment.


United States Marine Corps

The historical background of the use of regiments in the United States Marine Corps (USMC) is contained within ''USMC: A Complete History'' Hoffman, J. ''USMC: A Complete History.'' (2002) Marine Corps Association: Quantico, VA. and a summary of that information follows: Before 1913, since the American Revolution, it was common practice for Marine detachments (both ship-based, and shore-based) to be combined to form provisional units. Most often these formations took the form of provisional
battalion A battalion is a military unit, typically consisting of 300 to 1,200 soldiers commanded by a lieutenant colonel, and subdivided into a number of companies (usually each commanded by a major or a captain). In some countries, battalions are ...
s, but on occasion would become provisional regiments, provisional
brigade A brigade is a major tactical military formation that typically comprises three to six battalions plus supporting elements. It is roughly equivalent to an enlarged or reinforced regiment. Two or more brigades may constitute a division. Br ...
s, or rarely (especially when combined with Navy personnel)
naval infantry Marines, or naval infantry, are typically a military force trained to operate in littoral zones in support of naval operations. Historically, tasks undertaken by marines have included helping maintain discipline and order aboard the ship (refle ...
brigades. These organizations were intentionally temporary as the Marine Corps did not usually maintain standing forces larger than company size, but rather created "task units" on an "as needed" basis. While provisional regiments, designated variously as the 1st through 4th Regiments, had been formed for expeditionary operations in Panama (1895) and Philippines (1899), the lineage of modern USMC regiments began in 1913 with the creation of the 1st and 2nd
Advanced Base Force The United States Marine Corps's Advanced Base Force (Advance Base Force in some references) was a coastal and naval base defense force that was designed to set up mobile and fixed bases in the event of major landing operations within, and beyond ...
Regiments. These two regiments, (currently the
2nd A second is the base unit of time in the International System of Units (SI). Second, Seconds or 2nd may also refer to: Mathematics * 2 (number), as an ordinal (also written as ''2nd'' or ''2d'') * Second of arc, an angular measurement unit ...
and
1st Marines The 1st Marine Regiment is an infantry regiment of the United States Marine Corps based at Marine Corps Base Camp Pendleton, California. The regiment is under the command of the 1st Marine Division and the I Marine Expeditionary Force. The 1st ...
, respectively), along with the numerical forbearers of the
3rd Third or 3rd may refer to: Numbers * 3rd, the ordinal form of the cardinal number 3 * , a fraction of one third * Second#Sexagesimal divisions of calendar time and day, 1⁄60 of a ''second'', or 1⁄3600 of a ''minute'' Places * 3rd Street (d ...
and
4th Marines The 4th Marine Regiment is an infantry regiment of the United States Marine Corps. Based at Camp Schwab in Okinawa, Japan, it is part of the 3rd Marine Division of the III Marine Expeditionary Force. Mission Close with and destroy the enemy by fi ...
, (formed in 1914 for the short-lived
Tampico Affair The Tampico Affair began as a minor incident involving U.S. Navy sailors and the Mexican Federal Army loyal to Mexican dictator General Victoriano Huerta. On April 9, 1914, nine sailors had come ashore to secure supplies and were detained by Me ...
with Mexico, involving the occupation of Veracruz, Mexico), are the pre-World War I antecedents to the several regiments of the modern U.S. Marine Corps. Beginning in World War I, with the U.S. Marine Corps' participation with the U.S. Army in the
American Expeditionary Force The American Expeditionary Forces (A. E. F.) was a formation of the United States Army on the Western Front of World War I. The A. E. F. was established on July 5, 1917, in France under the command of General John J. Pershing. It fought alon ...
, in which the 5th and
6th Marines The 6th Marine Regiment (also referred to as "6th Marines") is an infantry regiment of the United States Marine Corps based at Marine Corps Base Camp Lejeune, North Carolina. The regiment falls under the command of the 2nd Marine Division of the ...
(along with the 6th Machine Gun Battalion) formed the 4th Marine Brigade of the U.S. Army 2nd Division, the Corps began organizing larger standing forces. World War I era USMC units mirrored equivalent U.S. Army units by employing the "square division" organizational plan in forming its regiments and brigades. During the Second World War, the Marine Corps organized its regiments and divisions under the "triangular division" model developed by the Army in 1939. Modern USMC regiments and divisions continue to be organized using a triangular model very similar to the WWII version, with slight variations to adapt to modern weapons, equipment, and enlisted rank structure. Current Marine infantry, field artillery, and combat logistics battalions are organized into regiments, commanded by a colonel. Marine infantry and field artillery regiments are sequentially numbered and are referred to generically as "Marines" or "Marine Regiment," as in 1st Marines (an infantry regiment) or 12th Marine Regiment (a field artillery regiment). Marine infantry regiments consist of a regimental Headquarters and Service Company (H&S Co) and three identical infantry battalions. Marine field artillery regiments consist of a regimental Headquarters and Service Battery (H&S Bttry), a Target Acquisition Battery, and from two to four field artillery battalions. Marine Logistics Groups (MLG) contain two types of regiments; one Headquarters (HQ) Regiment (except in the Reserve 4th MLG) and two Combat Logistics Regiments (CLR). Each of these two types of regiments contain a Headquarters Company and varying numbers and types of logistics battalions and separate logistics companies, depending upon whether the regiment's primary mission is to provide direct support to (1) a Regimental Combat Team (RCT) or a Marine Amphibious Unit (MEU), or (2) provide general support across the Marine Expeditionary Force (MEF), including intermediate ground logistics support to Marine aviation units. These varying types of battalions and separate companies include: Combat Logistics, Maintenance, and Supply battalions, and Combat Logistics, Communications, Food Service, and Service companies (the latter three types in 3rd MLG only). The HQ Regiments (whose primary mission includes providing support to the MEUs) are not numbered; however, the CLRs are numbered according to their primary mission. Combat Logistics Regiments that support Regimental Combat Teams have the same number as the parent Marine Division of its supported RCT. Therefore, CLR 2 supports the RCTs of the 2nd Marine Division. CLRs that provide general maintenance and supply support to the MEF are designated by a two-digit number, the first digit is the Hindu-Arabic numeral equivalent of the MEFs Roman numeral designation and the second digit is always an arbitrarily assigned numeral "5." Therefore, the CLR that provides general maintenance and supply support to III MEF is CLR 35. The Marine Corps deploys
battalion A battalion is a military unit, typically consisting of 300 to 1,200 soldiers commanded by a lieutenant colonel, and subdivided into a number of companies (usually each commanded by a major or a captain). In some countries, battalions are ...
s from its infantry regiments to form the nucleus of a Battalion Landing Team (BLT) as the Ground Combat Element (GCE) of a
Marine Expeditionary Unit A Marine expeditionary unit (MEU, pronounced as one syllable "" IPA: ) is the smallest air-ground task force (MAGTF) in the United States Fleet Marine Force.Regimental combat team A regimental combat team (RCT) is a provisional major infantry unit which has seen use by branches of the United States Armed Forces. It is formed by augmenting a regular infantry regiment with smaller combat, combat support and combat service ...
(RCT) or Regimental Landing Team (RLT) as the GCE of a Marine Expeditionary Brigade (MEB). In both cases the infantry component is reinforced with ground combat support forces including field artillery, reconnaissance, assault amphibian vehicle, light armored reconnaissance vehicle, tank, and combat engineer units. The resulting GCE is then combined with an Aviation Combat Element (ACE), a Logistics Combat Element (LCE), and a Command Element (CE) to form a
Marine Air Ground Task Force Marine Air-Ground Task Force (MAGTF, pronounced MAG-TAF) is a term used by the United States Marine Corps to describe the principal organization for all missions across the range of military operations. MAGTFs are a balanced air-ground, combined ar ...
(MAGTF).


See also

*
Demi-brigade A ''demi-brigade'' ( en, Half-brigade) is a military formation used by the French Army since the French Revolutionary Wars. The ''Demi-brigade'' amalgamated the various infantry organizations of the French Revolutionary infantry into a single ...
*
Military organization Military organization or military organisation is the structuring of the armed forces of a state so as to offer such military capability as a national defense policy may require. In some countries paramilitary forces are included in a nation ...
*
Regimental combat team A regimental combat team (RCT) is a provisional major infantry unit which has seen use by branches of the United States Armed Forces. It is formed by augmenting a regular infantry regiment with smaller combat, combat support and combat service ...
*
Regimental depot The regimental depot of a regiment is its home base for recruiting and training. It is also where soldiers and officers awaiting discharge or postings are based and where injured soldiers return to full fitness after discharge from hospital b ...
*
Regimental police Regimental police or regimental provost (RP) are soldiers responsible for regimental discipline enforcement and unit custody in the British Army, other Commonwealth armies and some armed forces structured in the British tradition. They belong to ...


References

* * {{Authority control Military units and formations by size