Columbia subject headings:
European Union countries--Military policy.
European Union.
National security--European Union countries.
Security, International--European Union countries.
Harvard subject headings:
European Union
European Union countries--Military policy.
National security--European Union countries
Security, International--European Union countries
Princeton subject headings:
European Union countries--Military policy.
European Union.
National security--European Union countries.
Security, International--European Union countries.