The Government is trying to give the army a greater variety of armoured vehicles.
The previous Government bought 105 LAVs, Light Armoured Vehicles, for $653 million.
The deal was attacked for being impractical, expensive and involving too many vehicles for the number of available crew.
Defence Minister Wayne Mapp says an additional concern is that is all the LAVs are the same, when there is a need for variables such as ambulance vehicles and mobile command and control systems.
Dr Mapp says the Defence Force is still working on how achieve this mix.
The LAVs were bought to deploy peacekeepers, but Dr Mapp says they have never been used overseas.