Officers, separation from service.
Article 117
ART. 117. Officers, separation from service.—No officer shall be discharged or dismissed from the service except by order of the President or by sentence of a general court-martial; and in time of peace no officer shall be dismissed except in pursuance of the sentence of a general court-martial or in mitigation thereof; but the President may at any time drop from the rolls of the Army any officer who has been absent from duty three months without leave or who has been absent in confinement in a prison or penitentiary for three months after final conviction by a court of competent jurisdiction.