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In page Herbert Hasler:

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Hasler was born in Dublin on 27 February 1914, the youngest son of Lieutenant Arthur Thomas Hasler (a Royal Army Medical Corps quartermaster), and his wife, Annie Georgina (née Andrews). His father died after the troopship Transylvania was torpedoed on 4 May 1917. Hasler was sent to Wellington College, where he was a keen sportsman. He was commissioned into the Royal Marines on 1 September 1932.