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Mark O'Keeffe enlisted in Blackboy Hill, Western Australia at the age of 26 on the 18th of January 1917. He had been born in Ballarat, Victoria, was single, and was employed as a Labourer. He volunteered and was stationed with the 1st Machine Gun Squadron, 2nd Reinforcement later transferring to the 3rd Machine Gun Squadron with the Regimental number 35 . He was discharged and Returned to Australia on the 10th of July 1919. He is buried in the Ballarat Cemetery. Tree number 2856.