@backinthebox They lived in a Naval city and were from a Naval family - even the GMs were involved in military comms in the war - one would tap out messages in Morse when distressed and in the full grip of dementia.
The most likely scenarios were that there would be an accident with weaponry or, at the time, the most likely size atomic weapon that would target such an important base as part of a first strike.
He was very specific. That's the point. The planning also acknowledged that there was a difference if a missile was ground detonated or an airburst - largely that they'd all be fucked, wherever they lived, so it wasn't worth moving further out - which is why they didn't later on when the average Soviet capabilities increased, although he had been considering it until new intelligence/information about it was made available to them.
Even now, because I know somebody who still does something similar, I know exactly where the cut off point is for projections of a dirty bomb going off, a small conventional nuclear device and chemical weaponry.
FIL was quite enthusiastic about where I live (before he ever started talking about his work in the 1960s and early 70s). Turns out if shit hits the fan and we're 'lucky' with what is used, I've got 20 minutes to make it exactly half a mile uphill - if I manage that, the geography and climate conditions of where I live means that the projected dispersal cloud/fallout will collapse down and miss us.
Of course, FIL did say that also gave us the freedom to be able to say 'fuck surviving this' and run half a mile in the opposite direction. He's very interesting to talk to now he's old and doesn't give a shite about the OSA anymore.
DP says the one type of programme he would never allow to be on were the nuclear attack type ones like Threads or documentaries about nuclear bombs, though. I suppose he'd seen a bit too much original source material to want to deal with the sanitised for TV stuff.