The U.S. Constitution is the bedrock of all American jurisprudence. Without it, no legal protections for human rights and no laws ensuring liberty or freedom exist. All branches of government require office holders to pledge oaths and/or commitments to upholding the U.S. Constitution. Commissioned and non-commissioned officers, as well as enlisted members of the Armed Forces, also take oaths to defend the Constitution.
When elected officials take their oaths, they are swearing to defend the U.S. Constitution. Constitutional oaths prohibit enacting and following unconstitutional laws and illegal orders. Constitutional oaths also prohibit oath takers from participating in and/or defending corruption, including covering up illegal actions of other oath takers.
In fact, defending the Constitution requires members of the Armed Forces to disobey illegal orders. And, in the case of alleged treasonous acts, members of the Armed Forces are constitutionally bound to arrest such offenders.