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Canada first fielded a corps-sized formation in the First World War; the [[Canadian Corps]] was unique in that its composition did not change from inception to the war's end, in contrast to British corps in France and Flanders. The Canadian Corps consisted of four Canadian divisions. After the Armistice, the peacetime [[Canadian Army|Canadian militia]] was nominally organized into corps and divisions but no full-time formations larger than a battalion were ever trained or exercised. Early in the Second World War, Canada's contribution to the British-French forces fighting the Germans was limited to a single division. After the fall of France in June 1940, a second division moved to England, coming under command of a Canadian corps headquarters. This corps was renamed [[I Canadian Corps]] as a second corps headquarters was established in the UK, with the eventual formation of five Canadian divisions in England. I Canadian Corps eventually fought in Italy, [[II Canadian Corps]] in northwest Europe, and the two were reunited in early 1945. After the formations were disbanded after VE Day, Canada has never subsequently organized a corps headquarters.
 
[[Royal Canadian Army Cadets]]: A corps size in the RCAC is different everywhere, depending on the size. The commanding officer can be a [[captain]] or(Previously, Commanding Officers of a large corps could have been a [[Major, (rankbut that capability has been removed with the creation of CJCR Group Order 5511-1)|major]].
 
====China====
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====Pakistan====
The [[Pakistan Army]] has nine manoeuvre corps, each commanded by a [[lieutenant general]]. Each corps is composed of at least two divisions. The corps HQ is the highest field formation in the army.
 
The paramilitary forces of Pakistan's two western provinces of [[Khyber Pakhtunkhwa]] and [[Balochistan (Pakistan)|Balochistan]] are the [[Frontier Corps]] (FC), which were founded in 1907 during [[British Raj|British rule]]. They are charged with guarding the country's western borders as well as providing internal security including guarding important sites and participating in law enforcement. They are divided into four sub-organisations: FC Khyber Pakhtunkhwa (North), FC Khyber Pakhtunkhwa (South), FC Balochistan (North), and FC Balochistan (South).
 
====Poland (1938–1939)====
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<!--This section is linked. Please see [[Special:WhatLinksHere/Corps]] before altering the name of this section.-->
[[File:XVIII Abn. Corps headquarters, 2009.jpg|thumb|The XVIII Airborne Corps command group returns home from [[Operation Iraqi Freedom]] in 2009]]
The structure of a field corps in the [[United States Army]] is not permanent; many of the units that it commands are allocated to it as needed on an ''ad hoc'' basis. On the battlefield, the corps is the highest level of the forces that is concerned with actual combat and operational deployment. Higher levels of command are concerned with administration rather than operations, at least under current doctrine. The corps provides operational direction for the forces under its command.
 
As of 2014, the active field corps in the US Army are [[I Corps (United States)|I Corps]] (pronounced "first core" not "eye core"), [[III Corps (United States)|III Corps]] and [[XVIII Airborne Corps (United States)|XVIII Airborne Corps]]; their lineages derive from three of the corps formed during World War I (I and III Corps) and World War II (XVIII Airborne Corps). On 12 February 2020, it was announced that the Army was reactivating [[V Corps (United States)|V Corps]] to bolster the presence of US forces in Europe.
 
===== American Civil War =====
The first field corps in the [[United States Army]] were legalized during the [[American Civil War]] by an act of Congress on 17 July 1862, although the term had been used previously to refer to any large portion of the army.<ref name="Eicher65">Eicher,&nbsp;J.,&nbsp;Eicher,&nbsp;D.&nbsp;(2002).&nbsp;Civil War High Commands.&nbsp;United States:&nbsp;Stanford University Press. pages 65-66</ref> Major General [[George B. McClellan]], for example, planned to organized the [[Army of the Potomac]] into corps of two or more [[Divisions of the United States Army#American Civil War|divisions]] and about 25,000 soldiers. However he delayed doing so partly for lack of experienced officers and partly for political reasons, until March 1862 when [[President Lincoln]] ordered their creation.<ref name="Wilson12">Wilson,&nbsp;J.&nbsp;B.&nbsp;(1998).&nbsp;Maneuver and Firepower: The Evolution of Divisions and Separate Brigades.&nbsp;United States:&nbsp;Center of Military History, U.S. Army. pages 12-15</ref>
 
The exact composition of a corps in the [[Union Army]] varied during the war, though it usually consisted of between two and six division (on average three) for approximately 36,000 soldiers.<ref name="Eicher65"/><ref name="NCMuseum">{{cite web|title=Civil War Army Organization and Rank|url=https://www.ncmuseumofhistory.org/civil-war-army-organization-and-rank|publisher=North Carolina Museum of History|access-date=23 January 2022|archive-date=18 July 2017|archive-url=https://web.archive.org/web/20170718010330/http://ncmuseumofhistory.org/civil-war-army-organization-and-rank|url-status=dead}}</ref> After [[Ambrose Burnside]] was given command of the Army of the Potomac in November 1862, he reorganized it into three "grand divisions" of two corps and a cavalry division each, but this structure was abolished when [[Joseph Hooker]] took over February 1863. This also leadled to the creation of a dedicated [[Cavalry Corps (Union Army)|Cavalry Corps]] of three divisions and [[horse artillery]] assigned to the corps headquarters. In the early years of the war, [[field artillery]] was either part of an artillery reserve under direct army control or assigned to individual divisions. However, after the [[Battle of Chancellorsville]] the divisional artillery was placed under corps control, with each corps assigned a [[Brigade (United States Army)#American Civil War|brigade]] of between four and six [[artillery battery|batteries]] commanded by the senior-most artillery officer. In general the other field armies tended to model their organization after the Army of the Potomac, including the gradual development of corps.<ref name="Wilson12"/><ref name="McGrath17">McGrath, John J. The Brigade: A History, Its Organization and Employment in the US Army.&nbsp;(2004).&nbsp;Fort Leavenworth, Kansas : Combat Studies Institute, US Army Command and General Staff College. pages 17-19</ref>
 
Corps were commanded by major generals because Congress refused to promote officers past that grade (with the exception of [[Ulysses S. Grant]] to [[lieutenant general]] in 1864).<ref name="McGrath17"/> To assist with their command, generals were allowed a number of [[Aide-de-camp|aides-de-camp]] and a [[military staff|general staff]] of other officers. This staff consisted of a chief of cavalry, a chief of artillery, and representatives of the [[War Department]]'s various bureaus:<ref>Eicher, page 40</ref> an assistant [[adjutant general]], a [[quartermaster]], an assistant [[inspector general]], a commissary of subsistence, an ordnance officer (all with the rank of [[lieutenant colonel]]) and a medical director. However, there were no dedicated [[Combat service support (United States)|combat service support]] formations as part of the corps. This meant that either civilian workers had to be hired or line soldiers detailed from their units to carry out the necessary tasks.<ref>Shrader,&nbsp;C.&nbsp;R.,&nbsp;Newell,&nbsp;C.&nbsp;R.&nbsp;(2011).&nbsp;Of Duty Well and Faithfully Done: A History of the Regular Army in the Civil War.&nbsp;United States:&nbsp;Nebraska. page 71</ref>
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1) In the title of the [[United States Marine Corps]], ''Corps'' is used as a service-branch designator, in much the same way as ''Force'' and ''Guard'' are used for the [[US Air Force]] and [[US Coast Guard]].
 
2) The [[US Army]] (all [[Structure of the United States Army#Active and Reservereserve Componentscomponents|components]]; [[Regular Army (United States)|Regular Army]], [[United States Army Reserve|Army Reserve]], and [[Army National Guard]]) uses administrative ''corps'', also known as [[Structure of the United States Army#Branches and Functionalfunctional Areasareas|''army branches'']], to group personnel with a common function. These include the [[U.S. Army Acquisition Support Center#Overview|Acquisition Corps]], [[United States Army Adjutant General's Corps|Adjutant General's Corps]], [[Chaplain Corps (United States Army)|Chaplain Corps]], [[Chemical Corps]], [[United States Army Civil Affairs and Psychological Operations Command#Civil Affairs Units|Civil Affairs Corps]], [[Cyberwarfare in the United States#Army|Cyber Corps]], [[Dental Corps]]*, [[United States Army Corps of Engineers|Corps of Engineers]], [[Finance Corps]], [[Judge Advocate General's Corps]], [[Logistics Corps]], [[Medical Corps]]*, [[Medical Service Corps]]*, [[Medical Specialist Corps]]*, [[Military Intelligence Corps]], [[Military Police Corps (United States)|Military Police Corps]], [[Nurse Corps]]*, [[United States Army Ordnance Corps|Ordnance Corps]], [[Psychological Operations (United States)#Army|Psychological Operations Corps]], [[Quartermaster Corps]], [[Signal Corps]], [[Transportation Corps]], and [[United States Army Veterinary Corps|Veterinary Corps]].* Each of these corps is also considered a [[United States Army Regimental System#Combat Support (CS), Combat Service Support (CSS), and Special Branches|''regiment'']] for purposes of: "... affiliation, ... loyalty and commitment, ... sense of belonging, ... unit esprit, and ... war fighting ethos." However, these regiments have no tactical function. The six corps (annotated by an asterisk above after each applicable corps' name) of the [[Army Medical Department (United States)|Army Medical Department]] (AMEDD) are included in the AMEDD Regiment
.<ref>Army Regulation 600-82: ''The U.S. Army Regimental System'' Chapter 2: Management of the U.S. Army Regimental System, 2–2. USARS purpose, page 2. http://www.17thinfantry.org/documents/dmor/AR%20600-82%20US%20ARMY%20Regimental%20System.pdf {{Webarchive|url=https://web.archive.org/web/20230109052453/http://www.17thinfantry.org/documents/dmor/AR%20600-82%20US%20ARMY%20Regimental%20System.pdf |date=9 January 2023 }}. retrieved 14 December 2016.</ref>
 
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==Non-military use==
The ambassadors, consuls and other foreign embassy staff in a country are collectively referred to as the [[diplomatic corps]] ({{lang-fr|corps diplomatique}}). In [[Australia]], embassy vehicles have [[Vehicle_registration_plates_of_Australia#Diplomatic|licence plates]] beginning with the letters DC (or DX).
 
[[The Salvation Army]] calls its local units/church "corps" (e.g. The Rockford Temple Corps, The St. Petersburg Citadel Corps), echoing the pseudomilitary name and structure of the organization.
 
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In the US, there are non-military, administrative, training and certification corps for commissioned officers of the government's [[Uniformed services of the United States|uniformed services]], such as the [[United States Public Health Service Commissioned Corps]] and the [[National Oceanic and Atmospheric Administration Commissioned Corps]].<ref>{{cite web |url=http://www.usphs.gov/aboutus/mission.aspx |title=Mission of Public Health Service at USPHS Commissioned Corps |publisher=Usphs.gov |date=2011-11-14 |access-date=4 July 2012 |archive-url=https://web.archive.org/web/20120801210117/http://www.usphs.gov/aboutus/mission.aspx |archive-date=1 August 2012 |url-status=dead}}</ref><ref>{{cite web |url=http://www.noaacorps.noaa.gov/ |title=NOAA Corps |publisher=Noaacorps.noaa.gov |access-date=4 July 2012 |archive-date=25 October 2016 |archive-url=https://web.archive.org/web/20161025103350/http://www.noaacorps.noaa.gov/ |url-status=live }}</ref>
 
Many volunteer municipal or university ambulance, rescue, and first-aid squads are known as VACs (volunteer [[ambulance corps]]). Prominent examples are the [[Order of Malta Ambulance Corps|Order of Malta]] (the largest in Ireland), [[Hatzolah]] (largest VAC network worldwide), [[Hackensack ambulance|Hackensack]] VAC. The usage of the term ''ambulance corps'' dates to [[American Civil War|Civil War]] Major General [[George B. McClellan]]'s General Order No 147 to create an "ambulance corps" within the [[Union Army]].<ref name=CivilWar/> GO 147 used ''corps'' in one of its standard military senses. However, subsequent formations of non-military ambulance squads continued to use the term, even where they adhere less to paramilitary organizational structure.
 
The [[Peace Corps]] was organized by the United States as an "army" of volunteers.