Ascension Island a staging point by the British military during the Falklands War. Ascension Island hosts one of four ground antennas (others are on Kwajalein Island, Diego Garcia, and Cape Canaveral) that assist in the operation of the Global Positioning System (GPS) navigational system. NASA operates a Meter Class Autonomous Telescope (MCAT) on Ascension Island for tracking orbital debris, which is potentially hazardous to operating spacecraft and astronauts, at a facility called the John Africano NASA/AFRL Orbital Debris Observatory. In 1501, the Portuguese navigator Afonso de Albuquerque sighted the island on Ascension Day (which fell on 21 May that year) and named
Afonso de Albuquerque 200 Hindu mercenaries and about eighteen ships. He then sailed to Malacca against orders and despite the protest of Diogo Mendes, who claimed command of the expedition. Afonso eventually centralized the Portuguese government in the Indian Ocean. After the Malaccan conquest he wrote a letter to the King to explain his disagreement with Diogo Mendes, suggesting that further divisions could be harmful to the Portuguese in India. Under his command was Ferdinand Magellan, who had participated in the failed embassy of Diogo Lopes de Sequeira in 1509. After a false start towards the Red Sea, they sailed to the Strait