 Nominally based in Alaska , the Sea @-@ based X @-@ band Radar ( <unk> @-@ 1 ) arrived on Ford Island in 2006 for maintenance and repairs and has returned several times since . Primarily used as a warhead @-@ detection radar system on a self @-@ propelled floating platform in the Pacific , its presence on the island has been controversial . The platform , with a cost reaching nearly US $ 1 @,@ 000 @,@ 000 @,@ 000 , has never actually made it to Alaska and conspiracy theorists argue that the platform is a mobile version of the High Frequency Active Auroral Research Program . 
