(a) The right of any member or other beneficiary to an annuity, benefit or refund accrues as of the date of enactment of this chapter.
(b) Except as otherwise provided, any annuity provided herein is payable for life in equal semi-monthly installments on the fifteenth and last day of each month from the beginning date fixed by the Administrator.
(c) An administrative fee may be charged for that portion of the month when the annuity or benefit payment begins after the first day of the month or ends before the last day of the month.
(d) No annuity or benefit may be increased, decreased, revoked or repealed, except for error, or where specifically otherwise provided by this chapter.
(e) The System may withhold any payment for verification that the member is still entitled to the annuity.