Who became the Commanding General of the US Army Air Forces and significantly increased its size?

The Commanding General of the US Army Air Forces who significantly increased its size was General Henry H. "Hap" Arnold. He played a crucial role in the expansion and development of the Army Air Forces during World War II, overseeing a substantial increase in personnel, aircraft, and operational capacity. Under his leadership, the Air Forces evolved from a relatively small component of the Army into a vital branch of the military with significant strategic capabilities. Arnold was instrumental in advocating for air power and ensured that the Air Forces received the necessary resources and training to meet the demands of wartime operations. His vision and leadership helped lay the groundwork for the future of aerial warfare and the eventual establishment of the independent U.S. Air Force.