Well...yeah, it's his flag. Or, well, given your description I'm pretty sure it is. I haven't seen any other flags around here either, so there's that.

[In about twenty or so minutes, Norma's at the community building where marco and Ace live as well as where the flag still stand, waving in the light breeze that passes every now and there. It's pretty high up from where they are on the ground, and Norma can barely see the finer details, but she points up there regardless.]

See? Waaaay up there! We can go get a closer look, if you want.