It is always interesting to have a retrospective view on the Cold War history (yes, that's easy with hindsight) and see how accurate, or inaccurate, the assumptions were back then, influenced by the mind set of those days. First Strike, the 1979 PBS documentary, is a good example of how assessment of one's own capabilities and of those of the opponent can trigger an enormous arms build-up in an era where disarmament and weapons control and limitations were the words of the day.
You can watch the documentary First Strike on YouTube in four parts: part 1, part 2, part 3 and part 4, or watch it here below with a link to the next part at each end. More on the U.S. estimates on the Soviet strategic capabilities, and how it often deviated from Soviet reality, is found on my post on US Strategic Intelligence on the USSR. In my Farewell Dossier post, you can read how the defense budget itself was used as a weapon to destabilize the Soviet Union. If you want to find out more on the Minuteman missiles, you can visit the Minuteman Missile National Historic Site website, where you'll discover lots of information, images and interview with Minuteman personnel. You can pay a virtually visit to a Minuteman Missile site with spherical panoramas (click-and-drag to move around).