"THE GERMAN ACES SPEAK" (which I finished reading a short time ago) is one of the best books of its kind that I've yet read. Each of the 4 former Luftwaffe fighter pilots who were interviewed had served in a variety of commands, both combat and administrative, throughout the Second World War. And in the case of both Adolf Galland and Eduard Neumann, both also served as combat pilots with the Condor Legion in the Spanish Civil War. [The Condor Legion was a German military unit which supported the Nationalist forces of General Francisco Franco in its fight against the Spanish Republican government. Franco triumphed in March 1939 and ruled Spain til his death in 1975.]
The perspectives the 4 men (Walter Krupinski, Galland, Neumann, and Wolfgang Falck) provide the reader on their military experiences and their insights (in particular, those of Galland - who served as the Luftwaffe's General of Fighters from November 1941 to January 1945 --- and Falck, who was one of the figures instrumental in the establishment and organization of the Luftwaffe's night-fighter arm) gained from direct dealings with the Third Reich's political leaders (Hitler and Goering) are revealing and amply demonstrate how a dictatorship can go awry (due to hubris and its own misdeeds) under wartime pressures.
Each of the 4 men survived the war, maintained their links with aviation (in both the civilian and/or military spheres) or went into business, and strove in their own respective ways to promote peace and understanding between former enemies. Sadly, Krupinski, Galland, Neumann, and Falck are no longer with us. But through this book, the reader can gain a deep understanding and appreciation of the challenges these men faced in war and peace.