Harry Truman actually said...
By virtue of the authority vested in me as President of the United States by the Constitution and Statutes, and as Commander in Chief of the Army and Navy, and in order to provide for the release for publication by individuals or groups, in so far as it may be done without prejudice to the public interest of certain scientific and technical data now or hereafter withheld from public dissemination for the purpose of national military security, to the end that such information may be of maximum benefit to the public, it is hereby ordered as follows:
06/07/1945