Columbia subject headings:
Europe--Defenses.
Europe--Military relations--United States.
North Atlantic Treaty Organization.
United States--Military relations--Europe.
Harvard subject headings:
Europe--Defenses.
Europe--Military relations--United States.
North Atlantic Treaty Organization
United States--Military relations--Europe.
Princeton subject headings:
Europe--Defenses.
Europe--Military relations--United States.
North Atlantic Treaty Organization.
United States--Military relations--Europe.