I for one am 100% done with giving soldiers any grace on these matters.

You should update your minimum. In the US military It’s actually an NJP to start. You can request court martial if desired and it goes from there.
Dishonorable discharge is very rare and you’re likely to end up with an OTH or BCD if the “infraction” is significant. I’d rather have some jail time than shoot civilians tbh.

The US has no draft, they choose to join, so they can go fuck themselves.
Assassins paid with taxpayer money, that's all they are.

Well we just have to make sure the consequences for obeying orders to commit war crimes are worse than what their superiors can dish out for disobeying those orders.