Section 65 ILCS 5/4-5-7 - Appointment and discharge procedure(a) In all cities in which Sections 10-1-1 through 10-1-45 are in effect, all municipal officers, assistants, and employees, expect those specified in Sections 4-5-2 through 4-5-5, and in paragraph (b) of this section shall be appointed and discharged only as provided in Sections 10-1-1 through 10-1-45. For the purpose of the performance of the duties imposed upon, and the exercise of the powers and authority vested in, the head of a department or office by Sections 10-1-1 through 10-1-45, the commissioner of each department, specified in Section 4-5-2, shall be considered the head of the department or office under Sections 10-1-1 through 10-1-45.(b) In all municipalities in which Sections 10-2-1 through 10-2-23 are in effect, all officers and members of the fire and police departments of those municipalities, including the chief of police and chief of the fire department, shall be appointed and discharged only as provided in Sections 10-2-1 through 10-2-23.(c) Nothing in this article shall prevent any city which adopts the commission form of municipal government from adopting Sections 10-1-1 through 10-1-45, or, when of the required population, from adopting Sections 10-2-1 through 10-2-23, or from adopting Sections 10-2-1 through 10-2-23 and Sections 10-1-1 through 10-1-45.(d) In all municipalities which are treated as having adopted Sections 10-2-1 through 10-2-23 before January 1, 1942, and which have also adopted the commission form of municipal government before January 1, 1942, Sections 10-2-1 through 10-2-23 shall continue in force in that municipality in like manner as such sections would have continued in force therein if the commission form of municipal government had not been adopted therein. But the council shall have the right and power to appoint and discharge the board of fire and police commissioners.