Cat Hill, Ascension IslandCat Hill is a settlement on Ascension Island, an island which forms part of the British Overseas Territories.HistoryThe Target Tracking Radar Station, known as the Golf Ball, was built on this site, designated for use as a base for the United States Armed Forces, between 1960 and 1961. The site subsequently became the location of the joint NSA-GCHQ Composite Signals Organisation facility on the island.