OK his Oath of Enlistment for starters:
I, (NAME), do solemnly swear (or affirm) that I will support and defend the Constitution of the United States against all enemies, foreign and domestic; that I will bear true faith and allegiance to the same; and that I will obey the orders of the President of the United States and the orders of the officers appointed over me, according to regulations and the Uniform Code of Military Justice. So help me God.
What was his officer’s oath?
Obedience to the President and superior officers is conditional - they must be obeyed or disobeyed according to the regulations and the UCMJ. The UCMJ requires orders to be given by people lawfully authorized to give them. War powers are given to Congress, which delegated them to the CIC and the SecDef acting under the authority of the CIC.
The Constitution doesn’t allow the CIC to ACT as President if he has “failed to qualify”. It only allows the VP/VP-elect to do so in that case.
So even the oath of enlistment requires disobedience to Barack Obama if the Constitution only authorizes Joe Biden to act as President. And that is a question only made more valid over time, as we see documentation of Obama’s election fraud and the fact that he had to use two forgeries rather than a genuine HI BC for some reason. SCOTUS refuses to answer that question - basically holding the whole Constitutional process hostage. Holding every enlisted man and woman hostage.