Harry Truman actually said...
To the extent no inconsistent with this order, appointments and position changes in the competitive service shall be made in accordance with civil service laws, rules, and regulations, and appointments and position changes outside the competitive service shall be made in accordance with such regulations and practices as the head of the agency concerned shall find necessary.
Context
Executive Order 10180—Establishing Special Personnel Procedures in the Interest of the National Defense
11/12/1950