What is the courts martial with the most authority?

The court martial with the most authority is the General Court Martial (GCM). It has the jurisdiction to try the most serious offenses under military law, including felonies that could result in severe penalties such as imprisonment or even death. General courts martial are composed of a military judge and a panel of officers or enlisted personnel, depending on the case. Their decisions can be appealed to the Court of Appeals for the Armed Forces.