Earlier quoted context omitted.
I guess… Why wouldn’t it be? At some point why would you keep it classified? Funnily enough I’m just reading a book on Draper Labs and there’s a huge amount of detail on old inertial guidance systems.
The book to read is “Inventing Accuracy” by Donald Mackenzie
I was hugely disappointed by Blind Man's Bluff despite all the praise for it as it was written for a lay-audience.