The Manager shall appoint and may remove a City Clerk, Treasurer, Assessor, Police Chief, Fire Chief, Public Works Director, Comptroller, Parks and Recreation Director, Airport Manager, Planning Director, and such other officers and heads of departments as may be deemed necessary. The powers and duties of these officers and heads of departments shall be as prescribed by State law, this Charter, the ordinances of the City, or the directions of the Manager. He may delegate appropriate functions and powers to them and they may redelegate the same to deputies of their choice within the administrative service. The compensation of the City Manager and all other officers and employees shall be fixed by the City Commission. City officers shall have the qualification of being registered electors of the City or shall become registered as an elector within sixty days after appointment unless expressly exempted by the City Commission.