Book excerpt: From the most important leaders and the most courageous victories to the earliest machines of flight and the most advanced Stealth technology, Walter J. Boyne's Beyond the Wild Blue presents a fascinating look at 50 turbulent years of Air Force history. From the prop-driven armada of World War II to the most advanced Stealth weaponry, from pioneers like General Henry "Hap" Arnold to glorious conquests in the Gulf War, Beyond the Wild Blue is a high-flying study of the triumphs (and failures) of leadership and technology. In three new chapters, Walter Boyne covers an eventful ten years, including 9/11, the invasion of Afghanistan, and the second Gulf War, describing in detail the technological advancements that led to highly efficient airstrikes in Iraq. He also takes stock of the Air Force's doctrine and mission statements as this unique sector of the military grapples with an ever-changing world.