C.O. is a hard sell when you have joined the force voluntarily.
Might have more success for refusal of an unlawful order.

That's why they spend so much time having them obey orders in the first place.

Snoofy, what type of units did you serve in to make that statement with such certainty?
Depending on the unit we would meet annually for a couple of hours as BTN or Brigade staff to discuss what constitutes lawful/unlawful orders.
When I was with an aviation brigade it was twice a year. At least in the N.G. it was a topic we took seriously.

I was in a medical unit. E Co. 434 MSB, 3- I.D. We were ordered to 'carry' a crew served weapon, ie. mounted 60 cal machine gun. That is not allowed, we refused, it was given to a transportation company that was part of our movement order. Medical personnel are only allowed personal arms such as a pistol or M16.
The topic of this thread is the National Guard, I don't believe they were involved in blowing up that boat.