Summary: We continue our Great Strategists series with "Three Pioneers of Airpower." In the early 20th century, Italian Giulio Douhet, American Billy Mitchell, and British officer Hugh Trenchard saw the battlefield changing as a result of the introduction of airplanes. What were their stories and what are the lasting impacts? Presenting these pioneers are War College professors Tami Davis Biddle and Jacqueline E. Whitt.