(battalions). It forms the framework needed to raise a national army during wartime or insurrection.

This fighting mission has not changed much since the Second World War, when the majority of combat units overseas were mobilized reserve battalions detached from their home regiments. In keeping with this mission, regiments of the Army Reserve exist at cadre strength and have a theoretical administrative capacity to support a full battalion upon mobilization, although they maintain a standing force that can typically deploy the manpower