Try voting out your sergeant.

Try having a political leader jailing people who don’t do what he tells them to do.

Ah, so you're comparing them on basis of formation of will.

That's not the point that was made, however. The post you replied to connected the military to democracies as protectors of their physical integrity.

The distinction is subtle and lost on most people. By liniking the military to elections, you can bet good money that every politician in the country would jump on acritical "support the troops" propaganda lines that result in de-facto fascism, like the US experienced under G.W. Bush.

The first thing any State does is place the military under civilian government control. This is actually a huge part of the Constitution (the Founding Fathers were very clever and they all read Ceasar's biography).