Operation Cornflakes was a World War II Office of Strategic Services PSYOP mission in 1944 and 1945 which involved tricking the German postal service Deutsche Reichspost into inadvertently delivering anti-Nazi propaganda to German citizens through mail.

The operation involved special planes that were instructed to airdrop bags of false, but properly addressed mail in the vicinity of bombed mail trains. When recovering the mail during clean-up of the wreck, the postal service would hopefully confuse the false mail for the real thing and deliver it to the various addresses.

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