Brigadier General William ("Billy") Mitchell: Highly Decorated American Pilot WWI. During inter-war period, Outspoken Proponent of Airpower. Critical of Navy's Unwillingness to accept Dangers of Attack From the Air. Despite proving his arguments by sinking warships during war games, he was court-martialed in 1925 & driven from military service. http://usarmy.vo.llnwd.net/e2/-images/2007/05/20/4283/
General Billy Mitchell, who helped lead the military’s development and use of airpower at the beginning of the 20th century. General Mitchell was a professional soldier who served as an infantryman in the Spanish-American War and went on to achieve greater fame as an outstanding U.S. combat air commander during World War I.
In September 1918 the energetic and tireless Billy Mitchell planned and led a total of almost 1,500 Allied aircraft during the St. Mihiel offensive, the largest concentration of aircraft to that date. He further led several hundred bombers in attacks behind German lines. Convinced of the emerging role of aircraft in strategic bombing Mitchell was however frustrated in demonstrating his ideas by the untimely (for him) end of the war in November 1918.
Billy Mitchell joined the list of distinguished people honored as part of the Pioneers of Aviation series, which began in 1978. Mitchell is considered the father of the U.S. Army Air Force, the aviation branch of the U.S. Army that became the U.S. Air Force in 1946. The stamp also pictures Mitchell's personal SPAD XVI biplane.