Yes, I’m sure that’s why he was never seriously threatened legally: the closest you could get to command would probably be Cambodia where he very explicitly told General Haig to start bombing a neutral country but in that case was also very clearly passing on Nixon’s direct order: “He wants a massive bombing campaign in Cambodia. He doesn’t want to hear anything. It’s an order, it’s to be done. Anything that flies, on anything that moves. You got that?”
I’m sure that if he’d ever had to face a hostile inquiry his defense would have been that when the President of the United States tells you to make a phone call, you do, and he’d almost certainly have been successful.