Columbia subject headings:
United States. Air Force--History.
United States. Army Air Forces--History--World War, 1939-1945.
World War, 1939-1945--Aerial operations, American.
Harvard subject headings:
United States. Army Air Forces--History.
Princeton subject headings:
United States. Air Force--History.
United States. Army Air Forces--History--World War, 1939-1945.
World War, 1939-1945--Aerial operations, American.