Exmouth remains, with every litre of fuel supplied from Fremantle by road train. The point is what assets are in place at that joint operated location. If it was considered strategically important for DARPA to relocate hardware from White Sands to the North West Cape, maybe that coastal target is still within reach. As others have referenced here, space has become a contested domain during two decades in pursuit of the Bush Doctrine. Australia is uniquely placed to offer ground based surveillance and even opportunities for equatorial launch or launch into polar orbit.