§ 578.
(b)
Promotions of warrant officers on the warrant officer promotion list shall be made when, in accordance with regulations issued by the Secretary concerned, additional warrant officers in that grade (or grade and competitive category), are needed.
(c)
A regular warrant officer who is promoted is appointed in the regular grade to which promoted, and a reserve warrant officer who is promoted is appointed in the reserve grade to which promoted. The date of appointment in that grade and date of rank shall be prescribed by the Secretary concerned. A warrant officer is entitled to the pay and allowances for the grade to which appointed from the date specified in the appointment order.
(Added [Pub. L. 102–190, div. A, title XI, § 1112(a)], Dec. 5, 1991, [105 Stat. 1497]; amended [Pub. L. 102–484, div. A, title X, § 1052(4)], Oct. 23, 1992, [106 Stat. 2499]; [Pub. L. 103–337, div. A, title V, § 501(c)], Oct. 5, 1994, [108 Stat. 2748]; [Pub. L. 117–263, div. A, title V, § 508(c)], Dec. 23, 2022, [136 Stat. 2560]; [Pub. L. 118–31, div. A, title V, § 503(a)], Dec. 22, 2023, [137 Stat. 240]; [Pub. L. 118–159, div. A, title XVII, § 1701(a)(13)], Dec. 23, 2024, [138 Stat. 2203].)