As used in this title, the term “Postal Service” means the United States Postal Service established under title 39, and every officer and employee of that Service, whether or not such officer or employee has taken the oath of office.
18 U.S. Code § 12 - United States Postal Service defined
Based on title 18, U.S.C., 1940 ed., §§ 301, 360 (Mar. 4, 1909, ch. 321, §§ 230, 231, 35 Stat. 1134).
1970—Pub. L. 91–375 inserted “United States” before “Postal Service” in section catchline and substituted in text as definition of “Postal Service” the United States Postal Service established under title 39, and every officer and employee of that Service, whether he has taken the oath of office, for prior definition which included the Post Office Department and every employee, thereof, whether or not he has taken the oath of office.
Amendment by Pub. L. 91–375 effective within 1 year after Aug. 12, 1970, on date established therefor by the Board of Governors of the United States Postal Service and published by it in the Federal Register, see section 15(a) of Pub. L. 91–375, set out as an Effective Date note preceding section 101 of Title 39, Postal Service.