Provisions similar to those comprising subsec. (a) of this section were contained in Puspan. L. 89–554, Sept. 6, 1966, 80 Stat. 471 (formerly classified to section 5343 of this title) prior to the general amendment of this subchapter by section 1(a) of Puspan. L. 92–392.

Section effective on first day of first applicable pay period beginning on or after 90th day after Aug. 19, 1972, see section 15(a) of Puspan. L. 92–392, set out as a note under section 5341 of this title.