Executive Order 9506—Modifying the Conditions Upon Which a Classified Status May Be Granted
By virtue of the authority vested in me by section 1753 of the Revised Statutes and by section 2 of the Civil Service Act (22 Stat. 403), it is hereby ordered as follows;
Hereafter no person shall be accorded a classified civil service status on the basis of his name having been reached on a civil service register unless he shall have been regularly selected for appointment from a certificate issued by the Civil Service Commission for probational appointment and shall have entered on duty pursuant to selection from such certificate.
FRANKLIN D ROOSEVELT
The White House,
December 12, 1944.
Franklin D. Roosevelt, Executive Order 9506—Modifying the Conditions Upon Which a Classified Status May Be Granted Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/355119