N.H. Rev. Stat. § 100-A:19-e
Notwithstanding the vesting requirements of RSA 100-A:10, any member who has creditable service in both group I and group II with at least 10 years combined creditable service and who, for reasons other than retirement or death, ceases to be a member of the retirement system may elect, as provided in RSA 100-A:10, to receive a vested deferred retirement allowance. A member who has made such election shall receive a split-benefit vested deferred retirement allowance commencing upon attainment of the minimum age as set forth in RSA 100-A:19-b in an amount equal to the service retirement allowance as provided in RSA 100-A:19-c based on average final compensation and creditable service at the time service is terminated, or at an earlier age in a reduced amount as provided in RSA 100-A:19-d.
RSA 100-A:19-e
1988, 161:6, eff. July 1, 1988.