This episode takes place in the 1970s.
At about the :20:00 mark Adm. Nelson is seen carrying a paperback book in his hand. Unlike most people who would have simply lain the book down flat on the table, he makes an effort to prop the book up against a lamp, making it possible for the audience to see the cover. It's the 1950s novel The Man In The Gray Flannel Suit, which had been made into a movie by Fox, (which also produced this series). This might seem like a case of product placement as a way to promote the movie, but that wouldn't make sense as the movie had been released almost ten years before.