Also, the Air Force was part of the Army in the early days, first as part of the Signal Corps, then as the Army Air Corps, then as the Army Air Force (AAF), and finally the independent Air Force.

• 同时早期的空军隶属于陆军，先是侦察部队，后来成为陆军航空部队，再变成陆军航空军，最后成为独立的空军。