Oh, it gets better. Many of our allies have so little military spending precisely because of our military bases on their territory, and our resulting ability to respond to threats with the same speed as their own military. So in some ways, we are, for better or worse, the world's policeman. And if we downsized our military, those nations would need to step theirs up (with accompanying spending increases on their end). Which makes me wonder if the U.S. is getting paid enough for our military services to those allies.

Heavy Lies the Crown

Not to mention that arguing for funding something by defunding an unrelated service only serves to complicate the debate. Modern US govt spending does not need to be balanced, the US govt has shown the ability to run insanely high deficits without US bonds being significantly downgraded.

If the argument was that the US can afford UBI because we can afford the military then that's more reasonable (although not quite correct as you pointed out).