We do not need a military, unless that's only to keep our southern border secure. But even that could, and in my opinion SHOULD be handled by the states on the boarder. There's no reason for any other country to invade. A small navy can provide enough protection without wasting money. That's easily funded by a small tariff in imported goods.
Roads existed for over a century in the US without income taxes. Railroads were mostly private investments, but were crammed through via imminent domain, which, it's another form of extortion.
In the digital age, we don't need embassies everywhere. We just don't. It's valid to have diplomats, but not full time.
Being a minarchist is fine, but, you're not quite there yet.
Any state, especially national gubments, is a boot on the neck of the people, and I will not tolerate it.