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.

In 1908, as a young Signal Corps officer, Mitchell observed Orville Wright’s flying demonstration at Fort Myer, Virginia. Mitchell took flight lessons at the Curtiss Flying School at Newport News, Virginia.

In June, he took private flying lessons at the Curtiss Flying School because he was proscribed by law from aviator training by age and rank, at an expense to himself of $1,470 (approximately $33,000 in 2015).[12] In July 1916, he was promoted to major and appointed Chief of the Air Service of the First Army.

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. He argued particularly for the ability of bombers to sink battleships and organized a series of bombing runs against stationary ships designed to test the idea.

Recognized as one of the top American combat airmen of the war alongside aces such as his good friend, Eddie Rickenbacker, he was probably the best-known American in Europe. He was awarded the Distinguished Service Cross, the Distinguished Service Medal, the World War I Victory Medal with eight campaign clasps, and several foreign decorations. Despite his superb leadership and his fine combat record, he alienated many of his superiors during and after his 18 months of service in France.

He antagonized many administrative leaders of the Army with his arguments and criticism and in 1925, his temporary appointment as a brigadier general was not renewed, and he reverted to his permanent rank of colonel, due to his insubordination. Later that year, he was court-martialed for insubordination after accusing Army and Navy leaders of an “almost treasonable administration of the national defense” for investing in battleships. He resigned from the service shortly afterwards.

On February 19, 1936, Mitchell died in New York City at Doctors Hospital of a coronary occlusion. He had been admitted to the hospital on January 28. He was 56 years old.

Mitchell was buried at Forest Home Cemetery in Milwaukee, Wisconsin. None of Mitchell’s children from his first marriage attended the funeral. His widow, Elizabeth, later married Thomas Bolling Byrd, the brother of Virginia governor Harry F. Byrd Sr. and explorer Richard E. Byrd.

Mitchell received many honors following his death, including a Congressional Gold Medal. He is also the first person for whom an American military aircraft design, the North American B-25 Mitchell, is named. Milwaukee Mitchell International Airport in Milwaukee, Wisconsin, is also named after Mitchell.