Contributions in the form of a deduction from compensation under section 1944 of this title shall cease for any Group A member who attains 25 years of creditable service and the member shall continue to accrue creditable service, without such a contribution, at the rate of one and two-thirds percent until the member retires. (Added 1989, No. 169 (Adj. Sess.), § 9; amended 2017, No. 165 (Adj. Sess.), § 23.)