 His mission was to observe Allied air operations during the early stages of World War II.As a result of his observations, he recommended many important changes to Air Corps equipment and tactics, including upgrading armament from .30 caliber to .50 caliber machine guns, and installing leak-proof fuel tanks, but his scathing comparisons of the German "Luftwaffe" with the Air Corps upset many officers.This resulted in his being sent back to Wright Field.