In warfare history, up to 80 years ago, you can’t radio anything quickly and even if, your radio would be intercepted.
The only way to give orders was a trumpet and drums, so was for centuries. The enemy could simply copy your trumpet and give false orders to your troops. So you bring a giant flag close to the trumpet and your soldier would obey only to orders coming from the trumpet below the big flag.
Army business is mostly marching, and less than 1% fighting. So now you have big flags and drums and trumpets, someone may say: let’s use them to cheer up the troops while walking thousand miles with 30-50kg backpacks.
Then why not, let’s use that on parades and cerimonial events. “If we show we have a great band and shiny flags, we are intrinsically showing we know how to do military stuff properly”
This being done for thousands of years, so it stick to the army culture.
If you have to show you are good, show you can play the music better than everyone else while you march at god speed, carry a fantastic huge flag for extra points.
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