The head of every department and office employing individuals entitled to receive a pension shall certify to the board all employees so employed and the amount of salary or wages which is paid to employees, together with dismissals, resignations or terminations of service, and, from office or department records, furnish other relevant information as the board requires. In the case of a volunteer fire company, "head of department or office" shall mean the president or secretary of the board of trustees of the volunteer fire company.