(a) Special courts-martial may be convened by any one of the following:
(1) Any person who may convene a general court-martial.
(2) The commanding officer of a brigade, regiment, a group, or a corresponding unit of the Army.
(3) The commanding officer of a wing, group, or corresponding unit of the Air Force.
(4) The commanding officer or officer in charge of any other command when empowered by the Adjutant General.
(b) If any such officer is an accuser, the court shall be convened by superior competent authority and may in any case be convened by the superior authority if considered desirable by the authority.