It’s called tradition, you silly bitch, and you are correct to laugh at it because it indeed looks stupid as fuck
I think this applies to all ceremonial military stuff: The queen’s guard, the India-Pakistani border guards (at least they own it), the french foreign legionnaires who go out with a fucking axe and an apron, the US also has a tendency to flash ancient rifles on parades and then… juggle them? And so does Russia, aside from whatever that shit in the OP-post is, always brings out an old WW2-era tank on parades, alongside with the only available prototype sample of a new one, which then proceeds to stall in the middle of it and has to be towed out with said WW2-era tank.
Here ya go.
Before you go on to tell anything,
This is definitely a parade. Don’t think I need to argue that synchronously throwing rifles at each other counts as pass juggling.