John McCallum

John McCallum was born in Glasgow in 1917, and was brought up there and in Oban. He left school aged 14 to work as a Boy Messenger in the Post Office. Aged 18, he transferred to its Engineering Department as a trainee and spent tw years on external telephone work, later being transferred to indoor work on switchboards. He joined the Supplementary Reserves in the Royal Signal Corps in 1935, where his step-brother Jimmy O'Neill was already enlisted.