Glengarry Boys' Brigade; namely Warrant Officers, Lieutenants and Brevet Captains. In 1932 Percy Sillitoe, the Chief Constable of the City of Glasgow Police, abolished the traditional custodian helmet and added a new feature to the peaked caps worn by his police officers. This new feature was a black and white chequered cap band based on the dicings seen on the glengarry headress of the Scottish regiments. The diced band, popularly known as the Sillitoe Tartan, later spread to police forces in Australia, New Zealand, and the rest of the United Kingdom, as well as to some other parts of the world,
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.