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, and in order to further the most effective administration of Federal scientific research and development activities, it is hereby ordered, in the interest of the internal management of the Government, as follows:
Context
Executive Order 9912—Establishing the Interdepartmental Committee on Scientific Research and Development
12/23/1947