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
British Transport Police When policing the Channel Tunnel, BTP constables have the same powers and privileges as members of Kent Police when in France, and will also be under the direction and control of the Chief Constable of Kent. BTP uniforms are similar and the rank system identical to other British police forces. The distinctive black jerseys with a black and white chequered pattern on the yoke have been replaced with black Windstopper fleeces. Officers in England, Wales and Scotland have now adopted the same uniform as the Scottish forces. A BTP constable does not lose the ability to exercise his powers when