For the purpose of this chapter, the following definitions shall apply unless the context clearly indicates or requires a different meaning.
   CHIEF and CHIEF OF POLICE.  The Chief of the Police Department, and includes any person designated Acting Chief by the CHIEF OF POLICE or by the City Manager.
   COMMANDING OFFICER.  An officer holding the rank of sergeant or above, or an officer designated as a temporary or acting shift commander by the Chief of Police or the City Manager.
   DEPARTMENT.  The Police Department of the city.
   OFFICER.  All sworn police officers and all other employees of the Police Department.
   RULES.  The rules of conduct and disciplinary procedure for law enforcement personnel, as adopted and amended from time to time by the City Council.
(`90 Code, § 16-1)