The UCMJ defines the military justice system and lists criminal offenses under military law. The law requires the President of the United States, acting as commander-in-chief of the Armed Forces, to write rules and regulations to implement military law. The President writes these rules and regulations by issuing an executive order known as the Manual for Courts-Martial (MCM). The MCM details rules and regulations for military court-martials and provides for maximum punishments for each military offense listed in the punitive articles of the UCMJ.

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