I find this thread to be interesting. Someone quoted the oath of enlistment. Fine, but that's not all of the obligation. I retired after 30 years of service in the Army. During those thirty years, I spent 3 as a recruiter. I served as a platoon sergeant, first sergeant, and command sergeant major. I feel it's safe for me to say I'm a subject matter expert on this topic.
Since someone quoted the oath of enlistment, I'll start there. First of all, the oath does not require you to obey all orders, or prevent you from giving your opinion to any superior above you to include the POTUS. There are lawful and unlawful orders. Unlawful orders are those that require a soldier to violate a higher authority, commit a crime, or exceeds the authority of the one giving the order.
Many may remember Lt. Calley and the 1968 My Lai massacre in Vietnam. Lt. Calley and his platoon went into the village and killed more than 300 villagers. Calley's defense was, "I was following orders." Even if it were true, he was guilty because he followed what he should have known as a commissioned officer the order was unlawful.
Now I'll address another part of the problem I see in this thread. Leaders are not subject matter experts on everything. For instance, a CEO is not an SME on everything in the corporation. He has vice-presidents of the major departments in the corporation who serve as his SMEs. The military is no different. As president, Trump is the commander-in-chief, but he's not a SME in all things doing with the military. If he's a good leader, he should pay attention to the advise he gets from the generals and admiral who serve on the Joint Chiefs of Staff. Even those on the JCS have SMEs. All command level leaders have them.
Can an SME correct a leader or suggest an alternative? Yes, but it's wise to do it in a professional manner. As a platoon sergeant, I was my platoon leaders SME on personnel and mission. I had more experience than the platoon leader. My squad leaders and team leaders had more experience than a 2LT. As a first sergeant I served as the company commander's SME, and as a battalion sergeant major I was the battalion commander's SME. However, I was not the only SME those officers had at his/her disposal. A good leader will pay attention to the advice his SMEs provide.
Trump had a high turnover rate of staff and cabinet members during his first administration. He hates to be advised to do something other than he wants to. If he had personnel who disagreed with him, he canned them. This term he has surrounded himself with butt kissers. He's had fired generals because they disagreed with him. We've all seen Trump go from praising someone and then calling them the worst person in that position because they actually doing the right thing, but not what Trump wanted.
Look at all the executive orders Trump has written and that have been overturned by the federal courts to include the SCOTUS. Have you ever noticed what is usually the first thing he says when overruled by the SCOTUS? "They got it wrong." Trust me, if he could fire any of them and replace them with someone who would go along with everything he does, he would.
I used to consider myself a Republican. I left the party and now consider myself a constitutional conservative. My father, my son, and myself made the Army a career to defend this nation and the Constitution. It pains me to see politicians on both sides of the aisle who ignore it. But what pains me more is when I see Christians who put politics above God.