The Oath of Office is a solemn oath taken by officers of the United States Uniformed Services on commissioning. It differs slightly from that of the oath of enlistment that enlisted members recite when they enter the service. It is statutory (i.e. required by law) and is prescribed by Section 3331, Title 5, United States Code...
One notable difference between the officer and enlisted oaths is that the oath taken by officers does not include any provision to obey orders; while enlisted personnel are bound by the Uniform Code of Military Justice to obey lawful orders, officers in the service of the United States are bound by this oath to disobey any order that violates the Constitution of the United States.
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