William Lendrum Mitchell (December 29, 1879 – February 19, 1936) was a United States Army officer who had a major role in the creation of the United States Air Force. Mitchell served in France during World War I and, by the conflict's end, commanded all American air combat units in that country. After the war, he was appointed deputy director of the Air Service and began advocating for increased investment in air power, believing that this would prove vital in future wars.
https://en.wikipedia.org/wiki/Billy_Mitchell