In what year was Hap Arnold appointed as Chief of the Army Air Corps?

Hap Arnold was appointed as Chief of the Army Air Corps in 1938. This appointment was significant in the development of the U.S. Air Force, as Arnold played a crucial role in advocating for the expansion and modernization of air power during a time of growing international tensions preceding World War II. His leadership and vision contributed to shaping the future of U.S. military aviation. This context makes 1938 a pivotal year in military history, marking the beginning of significant changes in how air missions and strategies would be developed and executed.