Star Fleet
Actually, the problem being addressed here is that the USA already has a "space force" of sorts. The problem is that it is distributed over several armed services and government agencies with no central coordination. Anyone who's worked for a large company with different divisions doing the same thing knows how horribly inefficient and toxic that is.
All this Space Force does is provide one organization providing this central task. It's gonna create tech jobs and you gotta like that.
Russia and China already have (or are working on) systems that can destroy U.S. and U.K. satellites, including explosive-laden satellites already in orbit shadowing their satellite targets. With a single command they move towards their target much like a magnetic mine, and BOOM - no more HBO!