The President of the United States of America, authorized by Act of Congress, July 2, 1926, takes pleasure in presenting a Bronze Oak Leaf Cluster in lieu of a Second Distinguished Flying Cross to First Lieutenant (Air Service) James Harold Doolittle (ASN: 0-271855), U.S. Army Air Corps, for extraordinary achievement while participating in an aerial flight. During March 1924, at McCook Field, Dayton, Ohio, Lieutenant Doolittle, piloting a Fokker PW-7 pursuit airplane, performed a series of acceleration tests requiring skill, initiative, endurance, and courage of the highest type. In these test a recording accelerometer was mounted in the airplane and the accelerations taken for the following maneuvers. Loops at various air speeds; single and multiple barrel rolls; power spirals; tail spins; power on and power off; half loop, half roll, and immelman turn; Inverted flight; pulling out of dive at various air speeds; flying the airplane on a level course with considerable angle of bank; and flying in bumpy air. In these test the airplane was put through the most extreme maneuvers possible in order that the flight loads imposed upon the wings of the airplane under extreme conditions of sir combat might, be ascertained. These test were put through with that fine combination of fearlessness and skill which constitutes the essence of distinguished flying. Through them scientific data of great and permanent importance to the Air Corps were obtained.