Yes you can. There might be consequences, but that will always be the case. If obeying orders breaks the law, and disobeying orders breaks the law, then you’re a criminal either way. Might as well do what you agreed to do when you joined the military: risk your life to defend the constitution.

“I was only following orders” didn’t work so well in Nuremberg.

UCMJ says otherwise. But in practice, I can tell you from experience that the consequences for any kind of refusal will be treated as mutiny and could cost you the rest of your professional life

They can actually