That applied to people who worked there, who could be imprisoned for breaking the Official Secrets Act. It was a matter of life and death at the time.
As I said previously, the lunar buggy can still be seen on the moon, by the satellite tracker at Parkes Astronomy site in Australia. Other...
Australia had a dish from 1961 which was tracking satellites. In 1969. NASA thought their pictures were of better quality than their own, so used Parkes pictures instead.
https://www.reuters.com/article/us-space-exploration-moon-australia-idUSKCN1UD07L
When I left the Navy, I had a job at...