David Thiem, Captain of the School in 1971, is a Minister of the Uniting Church and has a parish based in Queanbeyan, New South Wales.
Since 1987 David Thiem has been a Uniting Church chaplain with the Royal Australian Navy and the Royal Australian Naval Reserve. His chaplaincy has included postings on board HMAS Westralia and HMAS Swan, and ashore at HMAS Cerberus, HMAS Stirling and at the Australian Defence Force Academy.
From September 1991 to March 1992 David Thiem saw operational service in the Persian Gulf on HMAS Sydney. He also saw active service on HMAS Melbourne during the INTERFET operation in East Timor, where he was seconded as chaplain to 3 Royal Australian Regiment.