HMAS Sydney , named after the city of Sydney, New South Wales, is the third and final ship of the Hobart class air warfare destroyers used by the Royal Australian Navy (RAN).

Fleet Base East is a Royal Australian Navy (RAN) major fleet base that comprises several naval establishments and facilities clustered around Sydney Harbour, centred on HMAS Kuttabul. Fleet Base East extends beyond the borders of Kuttabul and includes the commercially-operated dockyard at Garden Island, and adjacent wharf facilities at nearby Woolloomooloo, east of the Sydney central business district in New South Wales, Australia. Fleet Base East is one of two major facilities of the RAN, the other facility being Fleet Base West. The fleet operates in the Pacific Ocean.