I'm not military and I have a question...

If down level military personnel are called into an operation and do not know the actual operation plans when they are called, how does the military vet soldiers who might not agree with very extreme and unprecedented orders like arresting Clinton or Obummer or Piglosi? Isn't it reasonable to think that some military personnel might not agree with this direction and not follow thru with the critical orders?

Please don't beat me up to hard or at least be gentle ?, I really am interested to know....