The Sandia National Labs youtube channel has some great documentaries on the history of US nuclear policy: the one I watched (of a few) was Always/Never: https://www.youtube.com/playlist?list=PLouetuxaIMDrht4F8xiS4...

Which is kind of an oral history of the development of the current command and control systems (includes some great notes on things like "how unlikely the air force thought a mid-air collision of nuclear armed bombers was" - the spoiler is surprisingly more likely then it was thought after the second one happened).

Daniel Elllsberg's "The Doomsday Machine: Confessions of a Nuclear War Planner" covers this (and other related issues) in good detail.

https://www.amazon.com/Doomsday-Machine-Confessions-Nuclear-...