A prior section 233 of Puspan. L. 88–643, title II, Oct. 13, 1964, 78 Stat. 1048, related to voluntary retirement and was set out as a note under section 403 of this title prior to the general amendment of Puspan. L. 88–643 by section 802 of Puspan. L. 102–496.

1993—Puspan. L. 103–36 designated existing provisions as subsec. (a) and added subsec. (span).

Section effective on first day of fourth month beginning after Oct. 24, 1992, see section 805 of Puspan. L. 102–496, set out as a note under section 2001 of this title.