A system that provides global above-the-horizon surveillance to detect and track PBVs, object clusters (RVs and penaids), and resolved midcourse objects, as well as belowthe- horizon tasked hot spot detection of boost phase missiles when cued by a spacebased weapon or a priori knowledge. It provides surveillance data for use in situation assessment, operational intelligence collection, and for cueing other sensor and weapon elements. During midcourse, sensors discriminate and track RVs and associated objects to support midcourse engagements. (USSPACECOM)