In the event of a small or large scale insurgency in the north, the RFSUs role would be to detect enemy landings, especially near the important economic and defence infrastructure in their areas of operation. In the extremely unlikely event of an invasion of northern Australia the RFSUs would operate in a 'stay-behind' capacity. Patrols remaining in the field deep behind enemy lines would inevitably end up supplementing their diets from the land in order to survive and complete their mission as the first line of defence for continental Australia. Tasks for such a scenario are reporting on enemy movements, calling in airstrikes, killing and capturing the enemy in close quarter combat or sniping roles, demolition by explosive or sniping to impede enemy advance, and disrupting enemy supply lines for as long as possible.