N.H. Rev. Stat. § 103:12
Any permanent policeman who accepts the provisions of this chapter may retire from active service after serving as a permanent policeman for a period of 25 continuous years or after reaching the age of 65 regardless of his period of service as a permanent policeman. Any permanent policeman accepting the provisions hereof who shall be dismissed from service after having served as a permanent policeman for a period of 25 continuous years, or after reaching the age of 65 regardless of his period of service as a permanent policeman, shall be entitled to the benefits of this chapter. Upon retirement a permanent policeman shall no longer be obligated to pay assessments to the retirement fund. The board may, if it deems proper, in a case of a break in a policeman's continuous service of not more than 3 years, construe as a period of continuous service of such policeman, by adding his service before the break to his service after the break.
RSA 103:12
1941, 166:11. RL 221:11. RSA 103:12. 1957, 50:3; 189:2. 1961, 191:3. 1963, 238:4. 1971, 365:1. 1979, 420:7, eff. July 1, 1979.