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A good point! I don't know how much that influenced the modern version of the myth (I see people cite the Truman Library and CIA websites for that), but it's probably part of the collective zeitgeist around it.
And I think @GregMitch would note, Groves was heavily involved in the making of "The Beginning or the End" and vetoed a lot of (true) things that were in the script. If he *didn't* try to veto the leaflet part (or even approved it), that's pretty duplicitous.
