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
City of Glasgow Police had little effect. A night of further rioting followed which resulted in the Army being called to assist the Police. By the following morning, tanks were deployed in George Square and machine gun crews occupied the roofs of the buildings overlooking it. In 1931, cuts in Government benefits lead to marches by the unemployed and riots in Glasgow Green, Saltmarket, and Jail Square. Fifty-one men were arrested. Glasgow's first radio patrol car system was put into operation in May 1936. In 1939, on the outbreak of Second World War, the Glasgow Police prepared and established the Air Raid Precautions Service.