(a) General rule.— Special courts-martial may be convened by any of the following:

1. (1) Any person who may convene a general court-martial.
2. (2) The commanding officer of a garrison, fort, post, camp, station, Pennsylvania National Guard base or station.
3. (3) The commanding officer of a brigade, regiment or corresponding unit of the Army.
4. (4) The commanding officer of a group or corresponding unit of the Air Force.
5. (5) The commanding officer or officer in charge of any other command when authorized by the Adjutant General.