Milwaukee County oversees operations from our Airport, Behavioral Health, Child Support, Combined Court Operations, Sheriffs Department, Community Reintegration Center, Human Services, Parks, Public Safety, Public Works, Fleet Operations, Transportation, and at the Zoo. Possession of one of the following licenses or permits required upon application: NIULPE 4th Class Stationary Engineer license OR ASOPE 2nd Class license OR City of Milwaukee High-Pressure Boiler Operators permit (higher-class permits accepted) required.