Pub. L. 84-737, tit. II, sec. 204

Sec. 204. Based on the service credited under this title, the commissioned grade in which a person is appointed under this title is: (1) for persons with less than three years of service: Second lieutenant. (2) for persons with at least three, but less than seven, years of service: First lieutenant. (3) for persons with at least seven, but less than fourteen, years of service: Captain. 70 Stat. 586 (4) for persons with at least fourteen, but less than twenty-one, years of service: Major. (5) for persons with at least twenty-one years of service: Lieutenant colonel. The name of each person appointed under this title shall be placed on the applicable promotion list immediately below the junior officer of the same grade having the same or next longer service for promotion purposes.