Book excerpt: In this precise, interpretive and informative volume, Higham looks at everything from the roots of strategic bombing and tactical air power to the lessons learned and unlearned during the invasion of Ethiopia, the war in China and the Spanish Civil War. He also considers the problems posed by jet aircraft in Korea and the use of Patriot missiles in the Persian Gulf. He covers anti-guerrilla operations, doctrine, industrial activities and equipment, as well as the development of commercial airlines.