On the current Starlink mission as the 2nd stage passed over the Indian Ocean I heard mention of contact with a ground station at Diego Garcia. Checking that article I found the subsection Space Shuttle following the section on the emergency landing site on the atol. It says:
Space Shuttle
The island was one of 33 emergency landing sites worldwide for the NASA Space Shuttle. None of these facilities was ever used throughout the life of the shuttle program, but were used during the Apollo Program.
How was an emergency landing site at Diego Garcia (or any of the emergency landing sites) used during the Apollo program? I wouldn't be surprised if computers or a communications ground station there was used, but I don't see how landing sites would come into play.
Diego Garcia landing strip at 01:44
seen in a stunning video stream from space!
Discussed further in Hovering Carbonite! Why do these satellite videos of Earth appear to be made from a geostationary location?