Notwithstanding any provision of chapter 83 of title 5, the annuity under subchapter III of such chapter of an officer or employee of the Central Intelligence Agency who retires on or after October 1, 1989, is not designated under section 2013 of this title, and has served abroad as an officer or employee of the Agency on or after January 1, 1987, shall be computed as provided in subsection (b).
For purposes of subsections (f) through (m) of section 8339 of title 5, an annuity computed under this section shall be deemed to be an annuity computed under subsections (a) and (o) [1] of section 8339 of title 5.
The provisions of subsection (a) of this section shall not apply to an officer or employee of the Central Intelligence Agency who would otherwise be entitled to a greater annuity computed under an otherwise applicable subsection of section 8339 of title 5.