Rank and precedence among regulars and reserves.
Article 118
ART. 118. Rank and precedence among regulars and reserves.—In time of war or public danger, when two or more officers of the same grade are on duty in the same field, or command, or of organizations thereof, the President may assign the command of the forces of such field, or command, or of any organization thereof, without regard to seniority of rank in the same grade.