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John Harold McGivering joined the Royal Naval Volunteer Reserve in 1941 as an Ordinary Seaman, recieving training at HMS RALIEGH and HMS WHADDON, before attending Cypher School at the Royal Naval College, Greenwich. Promoted to Temporary Midshipman in 1942, McGivering was posted to the Cypher Office in Portsmouth, before going overseas to Freetown, Sierra Leone in 1943. Promoted to Temporary Sub-Lieutenant in 1943, he was then stationed at the Coastal Forces base at Pembroke, after which he was posted Ceylon as a Transport Officer in 1946. After returning to England in 1947, McGivering pursued a career as an estate agent whilst on reserve, until he was posted to Falmouth from 1958 to 1962. He recieved two further promotions, being made Lieutenant in 1962, then Lieutenant Commander in 1970. McGivering then took up a position in the Civil Service, retiring in 1979.