I disagree. It is the job of congress. No congressional approval - no military deployment.
In this instance I agree. Failing that though, what option does the military leader have? If he truly thinks the action is outside the law, both nationally and perhaps a war crime type action, then all he can do is resign.
The CIC should never put the military leaders in this position.
The president should have authority to respond to attacks or imminent threats, but this sort of things should be handled by Congress. There’s no justification for Obama taking action here.
If he tries it without Congressional approval, I still advocate resignations rather than a refusal to take action in place.
Perhaps you reject the idea military leaders should refuse if Congress doesn’t approve first.