You do realize that is every single person in the US military (excepting the basic training recruits).
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The U.S. Serviceman's oath is FIRST to The United States Constitution - then the President.
If the POTUS issues UNLAWFUL orders, the Constitution TRUMPS the POTUS. Look closely at the words
"foreign" and "domestic."Oath of Enlistment
I, _____, 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." (Title 10, US Code; Act of 5 May 1960 replacing the wording first adopted in 1789, with amendment effective 5 October 1962).