Military conscription has existed for two periods in modern times, related to WW1 and WW2 respectively: 1916 - 20 ("military service") and 1939 - 60 ("national service" or sometimes "war service"). The last conscription term ended in 1963.
In WW2, by 1942 all male British subjects between 18 and 51 years old and all females 20 to 30 years old resident in Great Britain and the Isle of Man were liable to be called up, with some exemptions, such as married women, clergy, police, etc. Initially the service period was 18 months but it was extended to 2 years.
Many saw it as an inconvenience, as it took them away from their jobs or studies. Whilst for others it was the opportunity for learning new skills. A lot of the recruits saw action in conflicts such as the Korean War.
For contrast see conscientious objectors.
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