(Mitchell, Gen. Billy). GENERAL BILLY MITCHELL - SIGNED AND INSCRIBED PHOTO DATED JANUARY, 1926 by an unknown photographer. A portrait photograph of the General in full uniform, inscribed "To President Lewis of my Alma Mater with the regards and admiration of Wm. Mitchell Jan. 1926." William Mather Lewis was President of George Washington University from 1923 to 1927. Mitchell resigned from the Army on February 1, 1926, after being found guilty of insubordination by a Court Martial, the charges arising from his allegations of incompetence against Army and Navy Officers who disagreed with his views about the importance of air power in warfare. This is one of a series of photos all apparently taken at the same sitting, all in the same uniform and pose, some with Mitchell wearing his hat, some without. 9 1/2 x 7 1/2 inches (image), 14 x 10 3/4 inches (sheet). In very good condition with some discoloration to the verso.