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Insubordination (is) defiance of an employer's authority including disobeying a lawful order or work assignment, abuse of a supervisor, etc. In my view, the abuse of a supervisor can be physical and/or verbal..
(see Civilian control of the military) Generally, an officer or soldier may be insubordinate to the point of mutiny if given an unlawful order, however. (see Nuremberg defense) In the U.S. military, insubordination is covered under Article 91 of the Uniform Code of Military Justice. It covers disobeying lawful orders as well as disrespectful language or even striking a superior. The article for insubordination should not be confused with the article for contempt.