Columbia subject headings:
Harvard subject headings:
Europe--Defenses.
Europe--Military relations--United States.
North Atlantic Treaty Organization. Summit (26th : 2016 : Warsaw, Poland)
Security, International--Europe.
United States--Military relations--Europe.
Princeton subject headings:
Europe--Defenses.
Europe--Military relations--United States.
North Atlantic Treaty Organization. Summit (26th : 2016 : Warsaw, Poland)
Security, International--Europe.
United States--Military relations--Europe.