Mass. Gen. Laws ch. 32 § 85I
Notwithstanding the provisions of section eighty-five G, any member of a police or fire department of a city or town which accepts this section in the manner hereinafter provided who is hereafter retired under the provisions of sections eighty to eighty-five F, inclusive, and who was appointed a reserve police officer or a reserve or call fireman prior to July first, nineteen hundred and thirty-seven, may, for the purposes of such retirement, be accredited as a part of his continuous service such service as a reserve police officer or reserve or call fireman as the retiring authority shall determine.
This section shall take effect in a city having a Plan E charter when accepted by an affirmative vote of two thirds of the city council, and approved by the city manager; in the case of other cities by a two thirds vote of the city council and approved by the mayor; and in a town by a majority vote at the annual town meeting.
Mass. Gen. Laws ch. 32, § 85I