General Discussion

Obviously not a lawyer so I had to keep pulling threads the further I went into it.

The executive summary is that it's a shit sandwich.
Mango Mussolini has immunity from criminal conviction in the performance of his duties. Not anyone else.

So when it comes to refusing to follow orders you believe are illegal, it's always going to be something that will have to be worked out after the fact.
Example: I am your commander and order you to do thing x and you truly believe that order is illegal. I tell you it is legal because it came from our president. You say "no, it's illegal" I release you from your duties, likely go to the brig and face a general court martial hearing.
But the proof is completely on the (soldier, airman, sailor or marine) to prove their case as to why it's illegal.
If they are wrong, they could get kicked out of the military, demoted or jailed or all three

If they are right, it was illegal but do it anyway, then they could be put on trial for crimes against humanity later.

Like I said, shit sandwich.