Smith Graham. The Mighty Eighth in World War Two

Countryside Books, 2014. — 304 p.May 1942, five months after the bombing of Pearl Harbor, the first airplanes and crews of the newly formed Eighth U.S. Army Air Force arrived in Britain. Over the next two years their numbers swelled to a massive and powerful force of bombers and fighters described by one USAAF General as ‘the greatest striking force the world has ever known’.
They occupied no less than 67 airfields in England and added a huge offensive capability to RAF Bomber Command. The Americans were dedicated to high altitude precision bombing in close formation and in daylight. The RAF, who had been bombing Germany at night since 1940, were joined by the Eighth in July 1943 to provide a round-the-clock bombardment.