Harry Truman actually said...

Since the principal purpose of the National Security Council and the National Security Resources Board is to advise and assist the President...

This plan provides for unified direction by the Chairman of the United States Civil Service Commission of the executive affairs of the Commi...

In the conduct of civil service operations the Chairman is subject to the regulations of the full Commission and to their investigatory powe...

In this they play a role similar in character to that of the various units of the Executive Office of the President.