I regret that I am unable to provide a reference list to direct the interested reader to more detailed information on nuclear weapons and their history. Security regulations prohibit me from commenting on or even referring to any publication that has received a “no comment” ruling from the United States government. My access to classified information could, by itself, inadvertently lend credibility to any cited source. Therefore, in the interests of fairness and security, I have chosen to exclude notes and references from this book.