This is the Australian Defence Force operation which contributes to the whole of government program to detect, intercept and deter vessels transporting unauthorised arrivals from entering Australia through the North-West maritime approaches.

Op RELEX II is currently based on a Task Group comprising one major fleet unit, an AP-3C Orion maritime patrol aircraft, Navy patrol boats and an army security element. A standby AP-3C Orion is available to deploy to provide a surge capability if required.

Operation Relex II includes units from all three services and supports Coastwatch and Customs .