Columbia subject headings:
Harvard subject headings:
Europe--Military relations--United States.
Europe--Politics and government--1989-
National security--Europe
United States--Foreign relations--Europe.
Princeton subject headings:
Europe--Defenses.
Europe--Foreign relations.
Europe--Military relations--United States.
Europe--Politics and government--20th century.
National security--Europe.
North Atlantic Treaty Organization.
United States--Military relations--Europe.