From the UK Foreign and Commonwealth Office

Entry requirements section (Permits) – access to the British Indian Ocean Territory is restricted and a permit is required in advance of travel; there are no commercial flights and permits for yachts are only issued to allow safe passage through the Indian Ocean (outer islands only); access to Diego Garcia is only permitted to those with connections either to the military facility or to the territory’s administration.

from Travel Advice Summary, which can be found at:

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