Last I looked “insubordination” is legitimate cause to convene a general court martial.
Or Article 134 UCMJ.
You might be surprised to discover how few people actually stand a court martial for insubordination. The General Billy Mitchell court martial didn't work out very well for the Army.
insubordination is legitimate cause to convene a general court martial.
military.findlaw.com
The Court Martial Process - Military Law - FindLaw
A court-martial is a criminal trial for members of the military who are accused of committing the crimes listed in the “Punitive Articles” section of the Uniform Code of Military Justice (UCMJ). ...
Others, such as desertion, mutiny, and insubordination, are specific to the military.