Not so. The nodes in the command chain have little if any ability to question the order they've been given. Officers are even selected based on their ability to

Not so. The nodes in the command chain have little if any ability to question the order they've been given. Officers are even selected based on their ability to carry out orders unthinkingly. In the US military, an order from POTUS is the ultimate command. The only part of the chain that matters is at the very top, specifically, the armed individuals who surround the President. They can choose to stage a coup or declare the President medically unfit.