Columbia subject headings:
United States--Foreign relations--1945-1989.
United States--Military policy.
Harvard subject headings:
Intervention (International law)
United States--Foreign relations--1977-1981.
United States--Foreign relations--1981-1989.
United States--Military policy.
Princeton subject headings:
Intervention (International law)
United States--Foreign relations--1977-1981.
United States--Foreign relations--1981-.
United States--Military policy.