The surveillance systems are used by Defence to monitor airspace using three major radar installations in Queensland, Western Australia and the Northern Territory.
Hundreds of Red Hat Enterprise-powered systems are situated at each of the three radar installations for ongoing support and maintenance.
Command and Control Centres for all three radars are monitored by the RAAF in Adelaide using HP workstations that also run Linux.
Birse said the decision to move Defence onto Linux systems was to realise scalability, customisation and cost-saving benefits.