Hap Arnold, born Henry Harley Arnold on June 25, 1886, was a prominent American military leader and aviation pioneer. He played a crucial role in the development of the United States Air Force during World War II and was the first person to hold the rank of General of the Air Force. Arnold's leadership and vision helped transform the U.S. military's air capabilities. Arnold was instrumental in establishing the Army Air Forces as a separate branch of the military. He advocated for advanced aircraft technology and strategic bombing, significantly influencing air warfare tactics. His contributions laid the groundwork for modern air power and the future of military aviation.