American World War I ace (1879–1936) regarded as the father of the US Air Force, whose zealous ambition and vocal criticism of the War and Navy departments following the war led to a court-martial and his resignation. TLS signed “Wm. Mitchell,” one page, 6 x 6.75, personal letterhead, December 5, 1930. Brief response to an admirer. In full: “I am glad to send you my autograph as you request.” In very good condition, with central vertical and horizontal folds (vertical fold passing through a single letter of the signature), show-through from mounting remnants to reverse, and a light area of staining to lower left. RR Auction COA.