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