Pub. L. 89-554, tit. 5, pt. III, subpt. B, ch. 33, subch. V, sec. 3364
Promotion; substitute employees in the postal field service
§ 3364. Promotion; substitute employees in the postal field service When substitute employees in the postal field service are appointed on the same day, each is entitled to be promoted to the regular force in the order in which his name appeared on the register from which he was originally appointed, if of the required sex, eligible, and willing to accept, unless the vacancy on the regular force is filled by transfer or reinstatement.