Henry Harley "Hap" Arnold was an American general officer holding the ranks of General of the Army and later, General of the Air Force. Arnold was an aviation pioneer, Chief of the Air Corps (1938–1941), commanding general of the United States Army Air Forces, the only United States Air Force general to hold five-star rank, and the only officer to hold a five-star rank in two different U.S. military services. Arnold was also the founder of Project RAND, which evolved into one of the world's largest non-profit global policy think tanks, the RAND Corporation, and was one of the founders of Pan American World Airways.
A young Henry Arnold at the second-seat controls of a Wright Model B airplane 1911
Colonel Henry Arnold in the War Department in Washington, D.C., April 1918
Major Henry H. Arnold with the first Liberty V12 aero engine completed
Maj. Gen. Mason M. Patrick, Chief of Air Service
General officers in the United States
A general officer is an officer of high military rank; in the uniformed services of the United States, general officers are commissioned officers above the field officer ranks, the highest of which is colonel in the Army, Marine Corps, Air Force, and Space Force and captain in the Navy, Coast Guard, Public Health Service Commissioned Corps (PHSCC), and National Oceanic and Atmospheric Administration Commissioned Corps (NOAACC).
Henry Knox in the uniform of a major general
Ulysses Grant in the uniform of a lieutenant general
Air Force Four-Star General Richard B. Myers with four-star rank insignia
General of the Army George C. Marshall and General of the Army Henry "Hap" Arnold
