Arnold Schwarzenegger--body-builder, real estate investor, former chairman of the President's Council on Physical Fitness, and action-film superstar-- was the first civilian to own a military transport vehicle in the United States. Bill Zehme of Rolling Stone described this "massive war wagon," known as a humvee, as "a tank with wheels." Every morning Schwarzenegger drives from his house in Santa Monica to the World Gym in Venice, California. At the gym where he made himself into Mr. Olympia and Mr. Universe, Arnold's reserved parking space is paved with marble. In a weight room full of oversized physiques, Arnold's presence is still colossal; in a country where everything from buildings to cars to restaurant portions is disproportionately large, Schwarzenegger is truly larger-than-life. "Arnold is the embodiment of the Superior Man," film director John Milius explained to Zehme. "Arnold is the Nietzschean man. There's something wonderfully primeval about him, harking back...