John Kennedy actually said...
By virtue of the authority vested in me as President of the United States, and upon the recommendation of the Administrator of the National Aeronautics and Space Administration, I hereby amend Executive Order No. 10849 of November 27, 1959, by revising the description of the design of the seal of the National Aeronautics and Space Administration as set out in that order to read as follows:
05/18/1961