However, let's stress that this is not to be derogatory. I would love (and prefer) to see a mass of swastikas, I really would, but we also need to think about the propaganda angle.
I am British, not an American, and to be honest, you Americans get on my bloody nerves - but even I would find a sea of Stars and Stripes very moving indeed. It would choke me up, genuinely it would, especially if the march was led by veterans - who don't even have to be Alt Right (you need to edge towards the mainstream and co-opt/meld it anyway).