An equal tax or a head tax is a “tax levied as a fixed sum on every individual.” I can see how it’s more appealing than a “flat” tax since it’s even flatter, but from what I could gather there’s never been a true head tax… In the Bible (men over 20), Quran
Most libertarians are not in favor of a strongly funded military. Of course, libertarians are on a sliding scale. I favor a strong domestic-based military that supports things like the border, able and ready to respond to threats from outside the country, but many libertarians don't even support that. They believe we could make due to militias.