<Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Army Headquarters is located in Andover, Hampshire . The army's structure is broadly similar to the Royal Navy and Royal Air Force, in that the four - star (general - equivalent) field commands have been eliminated . Under the Army 2020 Command structure, the Chief of the General Staff is in charge of Army Headquarters . There are four lieutenant - general posts in Army headquarters: Deputy Chief of the General Staff, Commander Field Army, Commander Allied Rapid Reaction Corps and Commander Home Command . Army Headquarters is responsible for providing forces at operational readiness for employment by the Permanent Joint Headquarters . </P> <P> The command structure is hierarchical, with divisions and brigades controlling groups of units . Major units are regiment - or battalion - sized, and minor units are company - sized units (or platoons). All units are Regular (full - time) or Army Reserve (part - time). </P> <P> Naming conventions of units differ for historical reasons, creating some confusion; the term "battalion" in the infantry is synonymous with a cavalry, artillery or engineer regiment, and the infantry "company" is synonymous with an engineer or cavalry squadron and an artillery battery . The table below illustrates the different names for equivalent units . </P>

Name 4 of the countries that sent troops to help the british army