Diego Garcia was discovered by Portuguese explorers in the early 1500s. It is the largest of fifty-two islands which form the Chagos Archipelago, located in the heart of the Indian Ocean. The island's name is believed to have come from either the ship's captain or the navigator on that early voyage of discovery.
In 1965, with the formation of the British Indian Ocean Territory (BIOT), Diego Garcia was under the administrative control of the British government of the Seychelles. In 1976, the Seychelles gained independence from England and the BIOT became a self-administering territory under the East African Desk of the British Foreign Office.
On March 24, 1971 construction began on a U.S. Naval Communication Facility. This construction was accomplished by units of the U.S. Naval Construction Force (Seabees). Naval Communications Station Pre-commissioning Detachment arrived to prepare for operations in December of 1972 and on March 20, 1973 the U.S. Naval Communications Stations, Diego Garcia, was commissioned. The communications facility was later changed to Naval Computer and Telecommunication Station (NCTS) in October of 1991.