WW I flying ace; an active champion for a strong independent air force, he was court-martialed for insubordination and suspended from duty for five years in 1925. TLS signed 'Wm. Mitchell,' one page, 5.5 x 6, War Department letterhead, June 7, 1921. Mitchell complies with an autograph request. In part, 'Your interest is appreciated and my autograph is appended hereon.' Double cloth matted and framed with a photo of Mitchell by his plane to an overall size of 15 x 18.25. In fine condition, with some light toning, a bit heavier at edges. COA John Reznikoff/PSA/DNA and RRAuction COA.
