Who was the Chief of the Air Corps that significantly expanded the military force during his leadership?

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The Chief of the Air Corps who significantly expanded the military force during his leadership was General Henry H. "Hap" Arnold. He played a crucial role in the development and expansion of the United States Army Air Forces (USAAF) before and during World War II. Arnold's leadership was vital in advocating for the use of air power in military strategy, which led to a significant increase in the number of aircraft, personnel, and resources allocated to the Air Corps. He championed advanced training programs, logistical support, and the integration of technology, which all contributed to transforming the Air Corps into a formidable branch of the U.S. military. His vision and strategic foresight not only strengthened the air component of the military but also laid the groundwork for the establishment of the United States Air Force as a separate branch after the war, thus cementing his legacy in military aviation history.