Pittsburgh Police hats with checkered bands, which are dark navy blue and gold in color, popularly known as the "Sillitoe Tartan" and named after its originator, Percy J. Sillitoe, Chief Constable of Glasgow, Scotland, in the 1930s. While the checkered band is a common police symbol in the United Kingdom, Australia and some European countries, the Chicago Police Department, Cook County Sheriff's Police, the Allegheny County Sheriff's Office, and the Pittsburgh Bureau of Police are the only police forces in the United States that have adopted it as part of their uniforms. As recently as July 1930, police were required to wear
Chief of police police forces and the 3 special police forces holds the rank of Chief Constable. The exceptions are the Metropolitan Police Service and City of London Police, where the chief police officer instead holds the rank of Commissioner. The umbrella term for the chief constables and commissioners is chief police officer. The term "chief officer", by contrast, includes the chief police officers and their deputies and assistants. The National Police Chiefs Council is the association for chief officers. The rank of Commissioner should not be confused with the Police and Crime Commissioners. They are elected officials who oversee a police force