Columbia subject headings:
Harvard subject headings:
Special forces (Military science)--United States--History--20th century.
Special operations (Military science)--United States--History--20th century.
United States--History, Military--20th century.
Princeton subject headings:
Special forces (Military science)--United States--History--20th century.
Special operations (Military science)--United States--History--20th century.
United States--History, Military--20th century.