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
Police ranks of the United Kingdom Inspector-General and had a different rank structure until 1 June 1970, when it fully adopted the rank system used elsewhere in the United Kingdom. The RUC has now been succeeded by the Police Service of Northern Ireland, which uses the same ranks, but has a different version of the rank insignia, with the star from the PSNI badge replacing the crown. Unusually, the star is worn below the pip by chief superintendents and by the Chief Constable, who wears both symbols above his tipstaves. The PSNI has retained the RUC's distinctive inverted (point-up) sergeants' chevrons. The Isle of Man Constabulary