Australia's ambition to build a fleet of killer drones takes its next step, with $400 million to be spent building three uncrewed aircraft capable of carrying lethal payloads.The Ghost Bat,the first military combat aircraft to be designed and manufactured in Australia for more than 50 years, is being developed byBoeing Defence Australiaunder contract with the Government.More than $600 million has already been spent on the top secret drone project, building eight aircraft for prototype testing.READ MORE:Ukraine expressed 'great interest' in Taipan helicopters before controversial landfill planThe 'Loyal Wingman' prototype. Credit: Department of Defence(Supplied)The MQ-28A Ghost Bat is designed to act as a "loyal wingman" providing support and armed protection of crewed aircraft, including the Super Hornet and F-35 fighter jets, or the E-7A Wedgetail and P-8 Poseidon surveillance planes.As well as offering fighter-like performance, Ghost Bats would ultimately be used for intelligence, surveillance and reconnaissance.The majority of the new funding will be spent developing unique technology that allows the Ghost Bats to work together and in coordination with crewed aircraft on combined missions.Ghost Bats are 12 metres long and have a range of 3700km and have been tested at Defence's base at Woomera in South Australia.The Ghost bat uses artificial intelligence to conduct teaming missions. Credit: Department of Defence(Supplied)The Defence Strategic Review recommended the Ghost Bat program be prioritised and Australia reached an agreement in March last year with the United States for collaborative development of the killer drones.This allows the sharing of classified information and technology in the development of payloads, sensors and other system infrastructure.Defence Industry Minister Pat Conroy said more than 55 Australian companies were continuing the Ghost Bat project, with more than 70 per cent of funding going to local industry.READ MORE:How the Australian Signals Directorate identified the Medibank hacker"The prosperity and security of our nation will always be a top priority for the Albanese Government," Conroy said."That's why giving our Air Force the critical capabilities it needs to protect Australians, and their interests, is paramount."The ADF is under increasing scrutiny for its procurement strategy and related cost blowouts, and the Defence Minister Richard Marles has effectively confirmed there are tensions between his office and the ADF leadership."I make no excuses or apologies for demanding excellence and a culture of excellence in the Department of Defence and in the Australian Defence Force, and there is a way to go before we have that culture of excellence in the Department of Defence and the Australian Defence Force," Marles told Parliament on Thursday.