The Operation Cornflakes occurred in February – March 1945 during World War II. It was a military propaganda provocation operation of the American intelligence in the enemy territory. Fake stamps similar to real issues of German postage stamps were produced and spread in the hostile territory. In philatelic terms, they are illegal and have status of forgeries, falsification (fakes) or cinderellas. The specific case of passage by mail was an interesting operation of Intelligence; otherwise, stamps in the circulation would be identified and destroyed by post employees and/or intelligence agencies of victim state.
- Gayle, D (2012-03-06). "Operation Cornflakes: How the Allies went postal in the secret propaganda war against the Nazis". MailOnline: News. Associated Newspapers Ltd, Part of the Daily Mail, The Mail on Sunday & Metro Media Group. Archived from the original on 2015-05-12. Retrieved 2015-05-12.