The Light Destroyer (DDL) program was a large project to build ten ships similar to the Royal Navy's Type 21 or Amazon class frigate for Australia during the 1970s and early 1980s. Rising costs saw the original number revised down to five and then three vessels before being stopped altogether in 1972. It was planned that some of these ships would be built at Cockatoo Island Dockyard, but only the Williamstown Naval Dockyard built the ships before the project ended.