Lieutenant General Elwood R. "Pete" Quesada, (1904–1993) was assigned as a brigadier general in October 1940 to intelligence in the Office of the Chief of Air Corps. He became commanding general of the 9th Fighter Command, where he established advanced headquarters on the Normandy beachhead on D-Day plus one, and directed his planes in aerial cover and air support for the Allied invasion of the European continent. He was the foremost proponent of "the inherent flexibility of air power", a principle he helped prove during World War II.