N.J. Stat. Ann. § 43:15A-131

Within 90 days following the effective date of this legislation, but not later than January 1, 1969, each present member of the Public Employees' Retirement System who is a national guard technician may elect to continue his participation in the State retirement system by filing a proper form expressing his final and irrevocable intention to continue as a member or he may elect to terminate his participation in the Public Employees' Retirement System of New Jersey by filing (a) a proper form waiving all of his rights and privileges in this system and (b) the required application for a withdrawal of his moneys credited to his account.