Originally published in 1927, this history is an insider's look at the problems and solutions facing our new aviation force in France in World War I. The author was particularly well suited for this task. Sent to France to investigate aerial bombardment problems on the Western Front,Toulmin was rapidly assigned to the Ordnance Division and later promoted to Chief of the Co-ordination Staff under Major General Patrick, Chief of Air Service. From May 1918 to the end of the war, he witnessed, and participated in, the complete overall of our Air Service. The book focuses on each of the staff areas. There are chapters on the responsibilities of the Supply and Repair Division, Personnel Division, Design and Projects Divisions and the Training Division. Also discussed in detail are activities of the Technical, Transportation, Liaison and Photographic Sections. This is one of the most important account of the organization of the American Air Service in WWI.