Columbia subject headings:
Harvard subject headings:
United States--Foreign relations--1945-1989.
United States--Foreign relations--1989-
United States--History, Military--20th century.
United States--History, Military--21st century
United States--Military policy.
Princeton subject headings:
United States--Foreign relations--1945-1989.
United States--Foreign relations--1989-
United States--History, Military--20th century.
United States--History, Military--21st century.
United States--Military policy.