The number of members of the Board of Selectmen shall be five, and the Board shall choose its own Chairman. The normal term of Selectmen shall be three years. Selectmen shall serve staggered terms with two positions open for election on consecutive years and one position open for election on the third year. Vacancies on the Board of Selectmen shall be filled in accordance with state statutes (currently 30-A M.R.S.A. § 2602, Subdivision 3). The Selectmen shall serve as Overseers of the Poor.