Question for all the services members

If you were given an immoral order, are you allowed to decline that order? Can you say no or challenge the commanding officer? What is the process to do that?

What country are you from and what would happen to you if you did decline the order? Like if you were ordered to bomb a hospital, or a civic center of any kind, and you said no, I won't do that, what would happen?

What are some of the reasons you think someone wouldn't decline an order like this?