SECTION 12. ADMINISTRATIVE OFFICES AND DEPARTMENTS.
   There shall be in the city government a police department, a fire department, a department of public works, a department of finance, and such other administrative departments as now exist or may by ordinance be created by the council. The city manager shall appoint as the head of each department a chief, supervisor or director, who shall be responsible for the efficient administration of the department, subject to the supervision and control of the manager. Except as otherwise provided by this charter or by general law, the head of a department need not be a resident of the city or state at the time of his appointment, but during his tenure of office shall reside in Harrison County.
   The council may by ordinance create, combine, change or abolish offices, departments or agencies, other than those established by this charter. Except as otherwise provided in this charter, the council may assign additional functions or duties to any office, department or agency created by it or by this charter, but may not discontinue or transfer any function or duty assigned by this charter to any particular office, department or agency.