That isn’t an answer so I’m going to assume you can’t answer.
Good grief son, argumentative must be your middle name. I said "What you've described, would clearly be an unlawful order."
But, reporting for duty and answering deployment orders are NOT in any way, shape or form "unlawful" orders. They are the major's orders, issued to him by his appropriate chain of command. One last time, uniformed personnel can not challenge the authority of command, to include the command of the duly-sworn President of the United States.
It is not a commissioned officer's prerogative to challenge the legal authority of the President - ever, in any circumstance including this one.
This major will lose and it is a utterly stupid legal strategy to pursue.