what is the point of trooping the colour
Trooping the Colour Trooping the Colour is an old ceremony whereby a battalion would fall in by companies and the colour-party would "troop" or march the colours through the ranks so that every man would see that the colours were intact. This was done before and after every battle. This ceremony has been retained through time and is today largely ceremonial.
Blue-collar worker The term blue collar was first used in reference to trades jobs in 1924, in an Alden, Iowa newspaper.[1]  The phrase stems from the image of manual workers wearing blue denim or chambray shirts as part of their uniforms.[2] Industrial and manual workers often wear durable canvas or cotton clothing that may be soiled during the course of their work. Navy and light blue colors conceal potential dirt or grease on the worker's clothing, helping him or her to appear cleaner. For the same reason, blue is a popular color for boilersuits which protect workers' clothing. Some blue collar workers have uniforms with the name of the business and/or the individual's name embroidered or printed on it.