Chaff is a military invention in which small particles of metal or plastic are dispersed in order to create a fake radar signature, an effective defensive counter-measure against missiles and enemy radar tracking.
It was developed in WW2, but both the Germans and the Allied engineers were afraid to deploy it because of how easy it would be to copy.
"Thus for over a year the curious situation arose where both sides of the conflict knew how to use chaff to jam the other side's radar, but refrained from doing so fearing that if they did so the other side would 'learn the trick' and use it against themselves."
https://en.wikipedia.org/wiki/Chaff_(countermeasure)
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