CAC Boomerang... The Boomerang was developed from the CA-16 Wirraway (a kind of Australian AT-6 Harvard). 250 Boomerangs were built. Although designed as a stop-gap fighter following the Japanese air attacks on Darwin, the Boomerang went on to become a first class close ground support aircraft, when replaced by faster types, such as the Kittyhawk and Spitfire. It did its best work attacking ground targets in New Guinea and the Pacific islands.