It's interesting you think space can be controlled, like it's a piece of real estate. Or, more likely, you're just trolling because you're bored of shooting small animals with your airgun.

As is, any country can launch a satellite. Afaik, all satellites can do presently is take pictures and emit or reflect radio and other waves. Maybe in 100 years there'll be a war over the moon. Until then seems there's more important things to worry about than unveiling your space flag.

To be clear, I don't have a problem with a country militarising their space fleet, if that's what they want to do. I just find it stupid for the POTUS himself to be spending his time right now making a big public thing of it. Can you imagine any other country introducing their space force with a special seargant with extra stripes and a goofy flag while tens of thousands are dying of a pandemic?