North Atlantic Treaty Organization (NATO)
- (from 1949 )Belgium
- (from 1949 )Canada
- (from 1949 )Denmark
- (from 1949 )France
- (from 1949 )Iceland
- (from 1949 )Italy
- (from 1949 )Luxembourg
- (from 1949 )Netherlands
- (from 1949 )Norway
- (from 1949 )Portugal
- (from 1949 )United Kingdom
- (from 1949 )United States
- (from 1952 )Greece
- (from 1952 )Turkey
- (from 1955 )Germany
- (from 1982 )Spain
- (from 1999 )Czech Republic
- (from 1999 )Hungary
- (from 1999 )Poland
- (from 2004 )Bulgaria
- (from 2004 )Estonia
- (from 2004 )Latvia
- (from 2004 )Lithuania
- (from 2004 )Romania
- (from 2004 )Slovakia
- (from 2004 )Slovenia