Wikimedia Commons has media related to Western Union (alliance).

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20th-century military alliances
European integration
Former international organizations
International military organizations
Intergovernmental organizations established by treaty
International organizations based in Europe
Military history of the European Union
Cold War organizations
1948 in military history
Military units and formations established in 1948
Organizations disestablished in 1951
Military alliances involving France
Military alliances involving Luxembourg
Military alliances involving the Netherlands
Military alliances involving Belgium
Military alliances involving the United Kingdom
History of NATO