The Infantry of the British Army comprises 49 infantry battalions, from 19 regiments. Of these, 33 battalions are part of the Regular army and the remaining 16 a part of the Army Reserve. The British Army's Infantry takes on a variety of roles, including armoured, mechanised, air assault and light.
A division is a large military unit or formation, usually consisting of between 6,000 and 25,000 soldiers. In most armies, a division is composed of several regiments or brigades; in turn, several divisions typically make up a corps.
A battalion is a military unit, typically consisting of 300 to 1,000 soldiers commanded by a lieutenant colonel, and subdivided into a number of companies. The typical battalion is built from three operational companies, one weapons company and one HQ company. In some countries, battalions are exclusively infantry, while in others battalions are unit-level organisations.
The Swedish Army is the land force of the Swedish Armed Forces.
Princess Patricia's Canadian Light Infantry is one of the three Regular Force infantry regiments of the Canadian Army of the Canadian Armed Forces. Formed in 1914, it is named for Princess Patricia of Connaught, daughter of the then-Governor General of Canada. The regiment is composed of three battalions, for a total of 2,000 soldiers. The PPCLI is the main lodger unit of Canadian Forces Base (CFB) Edmonton in Alberta and CFB Shilo in Manitoba, and attached to 3rd Canadian Division; as such, it serves as the "local" regular infantry regiment for much of Western Canada. The Loyal Edmonton Regiment (LER), a Reserve Force battalion, is affiliated with the PPCLI but is not formally part of it. As part of this affiliation, the LER carries the designation '4th Battalion, Princess Patricia's Canadian Light Infantry'.
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 Military Forces, the Militia and, unofficially, the Australian Military Forces. In 1980, however, the current name—Australian Army Reserve—was officially adopted, and it now consists of a number of components based around the level of commitment and training obligation that its members are required to meet.
The Royal Canadian Regiment (RCR) is an infantry regiment of the Canadian Army. The regiment consists of four battalions, three in the Regular Force and one in the primary reserve. The RCR is ranked 1st in the order of precedence amongst Canadian Army infantry regiments, but in a quirk of the rules of seniority, its 4th battalion is 9th.
The Jamaica Defence Force (JDF) is the combined military of Jamaica, consisting of an infantry Regiment and Reserve Corps, an Air Wing, a Coast Guard fleet and a supporting Engineering Unit. The JDF is based upon the British military model, with similar organisation, training, weapons and traditions. Once chosen, officer candidates are sent to one of several British or Canadian basic officer courses depending upon the arm of service. Enlisted soldiers are given basic training at JDF Training Depot Newcastle. As in the British model, NCOs are given several levels of professional training as they rise up the ranks. Additional military schools are available for speciality training in Canada, the United Kingdom, and the United States.
The Trinidad and Tobago Regiment is the main ground force element of the Trinidad and Tobago Defence Force. It has approximately 10,000 men and women organized into a Regiment Headquarters and four battalions. There is also a Volunteer Defence Force that has been renamed the Defence Force Reserves. The regiment has two primary roles: maintaining the internal security of Trinidad and Tobago, and the assistance of local law enforcement.
The Rifles is an infantry regiment of the British Army. Formed in 2007, it consists of four Regular battalions and three Reserve battalions, plus a number of companies in other Army Reserve battalions. Each battalion of The Rifles was formerly an individual battalion of one of the two large regiments of the Light Division. Since formation the regiment has been involved in combat operations, first in the later stages of the Iraq War and in the War in Afghanistan.
The 8th/9th Battalion, Royal Australian Regiment is a motorised infantry battalion of the Australian Army. It was originally formed in 1973 by linking together both the 8th and 9th Battalions of the Royal Australian Regiment. Over the next twenty-four years the battalion would remain on the Australian Order of Battle based at Enoggera Barracks in Brisbane, Queensland, until it was disbanded in 1997 amid a number of Defence-wide cutbacks introduced by the Howard government. In 2006 it was announced that the battalion would be re-raised as part of a plan to expand the size of the Army and since then it established itself as a fully deployable motorised infantry battalion as part of 7th Brigade.
Below is an estimated list of the major units deployed within the Multi-National Force – Iraq and other United States military units that were operating in Iraq under the U.S. Central Command (USCENTCOM) in 2009, during the Iraq War.
The 4th Battalion, Parachute Regiment, is an Army Reserve unit of the British Army. Now recruiting across the United Kingdom originally the Battalion covered the North of England, with its headquarters located in Pudsey, West Yorkshire. Following the Options for Change review in 1993, 4 PARA amalgamated with the 15th (Scottish) Battalion of the Parachute Regiment, which was downsized and became 15 (Scottish) Company of 4 PARA. As part of further changes in 1999, the Battalion also merged with the 10th (Volunteer) Battalion which then became 10 (London) Company.
The Regimento de Paraquedistas, based in Tancos, Portugal, is a unit of the Portuguese Army and serves as the instruction center for recruitment and training of the Portuguese paratroopers. This unit includes an entire battalion, acting as support and reserve for airborne units which contains for example, military war dogs and airborne pathfinders and an instruction battalion responsible for the forming of new paratroopers.
3rd Battalion, The Royal Canadian Regiment (3 RCR) is a regular force light infantry battalion of the Canadian Forces. 3 RCR's most notable service occurred in Korea, Germany, Bosnia and Afghanistan. In 2006–2010, the battalion was deployed to Kandahar Province, Afghanistan. All three rifle companies were deployed at various times during this period of combat. Also notable was the period between 2003 and 2004, when it was the initial Canadian Forces unit to serve as part of the International Security Assistance Force, deploying to Kabul in August 2003.
Army 2020 was the name given to the restructuring of the British Army in the early and mid-2010s, in light of the Strategic Defence and Security Review 2010. The plan, as its name suggested, was intended to be completed by 2020, though most of its reorganisations were completed by the middle of the decade. It was succeeded by Army 2020 Refine, a series of new changes and refinements of Army 2020's restructuring, conducted in light of the Strategic Defence and Security Review 2015.
Plan Beersheba was a significant restructure of the Australian Army, announced in 2011. The process of implementing the organisational changes began in 2014, and was completed in 2017.
The Czech Land Forces are the land warfare force of the Czech Republic. The Land Forces consisting of various types of arms and services complemented by air and special operations forces constitute the core of the Czech Armed Forces. Land Forces Command is located in Olomouc.
The structure of the British Army is being reorganised to the Future Soldier structure. The Army is commanded by the Chief of the General Staff (CGS), with Army Headquarters which is located in Andover, Hampshire. Subordinate to that post, there is a Commander Field Army, and a personnel and UK operations command, Home Command.
Future Soldier is a reform of the British Army resulting from the Integrated Review of Security, Defence, Development and Foreign Policy published in March 2021. The aim of the reform is to create a more lethal, agile and expeditionary force, able to fight and win wars and to operate in the grey-zone between peace and war. Future Soldier was published on 25 November 2021 and deals with the organizational changes of the British Army, with changes to personnel and equipment were set out in the Defence in a Competitive Age paper published on 22 March 2021.
Jamaica 
Jamaica Defence Force 
