Columbia subject headings:
United States--Armed Forces--Aviation--History--20th century.
United States--Armed Forces--History--Vietnam War, 1961-1975.
Vietnam War, 1961-1975--Aerial operations, American.
Vietnam War, 1961-1975--Aerial operations.
Harvard subject headings:
United States--Armed Forces--Aviation--History--20th century.
United States--Armed Forces--History--Vietnam War, 1961-1975.
Vietnam War, 1961-1975--Aerial operations
Vietnam War, 1961-1975--Aerial operations, American
Princeton subject headings:
United States--Armed Forces--Aviation--History--20th century.
United States--Armed Forces--History--Vietnamese Conflict, 1961-1975.
Vietnam War, 1961-1975--Aerial operations, American.
Vietnam War, 1961-1975--Aerial operations.