I have no military or band marching experience, but I was a wheel monitor in a couple of parades in San Francisco. Nothing too glamorous - just walking alongside the float or tow vehicle to theoretically prevent idiots from running into the street and getting run over. One year, I was at the back right wheel of a flatbed holding about a dozen clog dancers and the next year, I was within arm’s reach of a stagecoach. The coach was on a flatbed (same one that carried the dancers?) as skinny stagecoach wheels vs streetcar tracks never goes well for the wheels.
The worst part was the confetti. Little glittery shards of mylar that stuck like glue to skin. Two days later, we were still finding bits of it on us.