Sing returned to Australia on submarine guard duty in late July 1918. An army medical report from 23 November 1918 noted that he had gunshot wounds in the left shoulder, back, and left leg, and had suffered gas poisoning. The report stated that his general health was 'good' but that he complained of coughing upon exertion. It recognised that Sing's disability were the result of service, was permanent, and recommended that he be discharged as permanently unfit for service. Following his departure from the army, he briefly turned his hand to sheep farming, but the land he was given was of poor quality. He then worked as a gold miner.