The end of the Vampire programme marked the beginning of an extended period when no complete aircraft were produced, although there was work for the company in various modification (see DHA-3 Drover) and repair and overhaul programmes, including repairing RAAF DHC-4 Caribous damaged on active service during the Vietnam War and major servicing of the RAAF Caribou fleet. The wings for the CAC CA-25 were built at Bankstown between 1956 and 1959. One design project pursued during this time was for a military jet trainer for the RAAF. HdH offered its P17 indigenous design derived from the Vampire and was also involved in the Government Aircraft Factories (GAF) F2 project, which would have seen HdH undertaking production work on this aircraft with GAF and the Commonwealth Aircraft Corporation (CAC). The CAC-built version of the Aermacchi MB-326 was selected for production in 1965 and neither project proceeded. However all was not lost as CAC subcontracted to HdH the manufacture of the wings and wingtip fuel tanks, tailplanes, ailerons, flaps, hydraulic system components and landing gear for the Macchi, as well as parts of the Macchi's Viper engines built by CAC.