The Class Z Reserve was a Reserve contingent of the

British Army The British Army is the principal Army, land warfare force of the United Kingdom. the British Army comprises 73,847 regular full-time personnel, 4,127 Brigade of Gurkhas, Gurkhas, 25,742 Army Reserve (United Kingdom), volunteer reserve perso ...

consisting of previously enlisted soldiers, now discharged. The first Z Reserve was authorised by an Army Order of 3 December 1918. When expected problems with violations of the

Armistice with Germany {{Short description, none This is a list of armistices signed by the German Empire (1871–1918) or Nazi Germany (1933–1945). An armistice is a temporary agreement to cease hostilities. The period of an armistice may be used to negotiate a peace t ...

did not eventuate, the Z Reserve was abolished on 31 March 1920. Following the Second World War, a new Z Reserve of soldiers and officers who had served between 3 September 1939 and 31 December 1948 were available for recall if under 45 years of age.The Bulletin – Google Books
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References

Army Reserve (United Kingdom) History of the British Army {{UK-mil-unit-stub