§ 2121.
(c)
An officer serving on active duty in the grade of ensign may, if found fully qualified for promotion in accordance with regulations prescribed by the Secretary, be promoted to the grade of lieutenant (junior grade) by appointment after he has completed twelve months’ active service in grade. The date of rank of an officer promoted under this subsection shall be the date of his appointment in the grade of lieutenant (junior grade) as specified by the Secretary.
(d)
When a vacancy in the grade of rear admiral occurs, the senior rear admiral (lower half) serving on the active duty promotion list shall be appointed by the President, by and with the advice and consent of the Senate, to fill the vacancy. The appointment shall be effective on the date the vacancy occurred.
(Added [Pub. L. 88–130, § 1(10)(C)], Sept. 24, 1963, [77 Stat. 181], § 271; amended [Pub. L. 91–278, § 1(8)], June 12, 1970, [84 Stat. 305]; [Pub. L. 97–417, § 2(5)], Jan. 4, 1983, [96 Stat. 2085]; [Pub. L. 99–145, title V, § 514(c)(1)], Nov. 8, 1985, [99 Stat. 629]; [Pub. L. 101–225, title II, § 203(2)], Dec. 12, 1989, [103 Stat. 1911]; [Pub. L. 103–337, div. A, title XVI, § 1677(b)(2)], Oct. 5, 1994, [108 Stat. 3020]; [Pub. L. 107–295, title III, § 313(3)], Nov. 25, 2002, [116 Stat. 2103]; renumbered § 2121 and amended [Pub. L. 115–282, title I], §§ 112(b), 123(b)(2), Dec. 4, 2018, [132 Stat. 4216], 4240; [Pub. L. 117–263, div. K, title CXII, § 11245(d)], Dec. 23, 2022, [136 Stat. 4046].)