Pub. L. 83-773, tit. IV, sec. 406

Sec. 406. Except as otherwise provided in this Act, the laws relating to the eligibility for promotion and the promotion of an officer of the regular component on a promotion list shall apply to an officer of the reserve component on a promotion list, except that— (1) a line officer of the Naval Reserve shall have, on promotion, the same date of rank which has been, or in due course will be, given the officer who is to be his running mate in the grade 68 Stat. 1169 to which promoted and shall be allowed the pay and allowances of the higher grade for duty performed from the date of the vacancy that such running mate was promoted to fill; and (2) an officer of the Marine Corps Reserve shall have, on promotion, the same date of rank which has been, or in due course will be, given the officer who is to be his running mate in the grade to which promoted, or, if considered for promotion by reason of being senior to a Reserve officer on active duty in the promotion zone, the same date of rank as that Reserve officer; and shall be allowed the pay and allowances of the higher grade for duty performed from the date he became eligible for promotion.