Columbia subject headings:
Military service, Voluntary--United States--History--20th century.
United States. Army--Recruiting, enlistment, etc.--History--20th century.
Harvard subject headings:
Military service, Voluntary--United States--History--20th century.
United States. Army--Recruiting, enlistment, etc.--History--20th century.
Princeton subject headings:
Military service, Voluntary--United States--History--20th century.
United States. Army--Recruiting, enlistment, etc.--History--20th century.