It has been called the single most historic event of the 20th century: On July 20, 1969, Neil Armstrong, Buzz Aldrin, and Michael Collins met John F. Kennedy’s call for a manned Moon landing by the end of the 1960s. A decade of tests and training, a staff of 400,000 engineers and scientists, a budget of billions, and the most powerful rocket ever launched all combined in an unprecedented event watched by millions the world over. And no one captured the men, the mood, and the machinery like Norman Mailer.