Columbia subject headings:
Harvard subject headings:
Iraq War, 2003-2011.
Iraq--Foreign relations--United States.
Korea (North)--Foreign relations--United States.
United States--Foreign relations--Iraq.
United States--Foreign relations--Korea (North)
United States--Foreign relations--Vietnam.
United States--Foreign relations.
United States--Military policy.
Vietnam--Foreign relations--United States.
War on Terrorism, 2001-2009
Princeton subject headings:
International relations.
Iraq War, 2003-2011.
Korean War, 1950-1953.
United States--Foreign relations.
Vietnam War, 1961-1975.