Neb. Rev. Stat. § 24-703.03

Any future member who has not previously retired prior to July 1, 2004, may elect to make contributions as provided in subdivision (2)(b) of section 24-703 and receive benefits as described in sections 24-707.01 and 24-708 . Such election shall be made by written notice delivered to the board not later than ninety days after July 1, 2004.