Re: Keeping 'Mum' was just SOP for those involved in WW2
I had a relative who was involved in decommissioning some very clandestine sites during the late 40s. Over the years he told me a few stories about it, plus how it was made incredibly clear to him how secret his work was.
A few years ago I found someone putting a museum & stories together about that work and contacted them. When I told my relative he clammed up and said he had nothing to tell them, it was secret. When I relayed that back apparently even after all these years very few people were talking.
“Loose lips sinks ships” etc was ingrained in that generation.