The following persons may be charged and tried together, namely:--
         (i) persons accused of the same offence committed in the course of the same transaction;
         (ii) persons accused of an offence and persons accused of abetment of, or an attempt to commit, such offence; and
         (iii) persons accused of different offences committed in the course of the same transaction:
     Provided that in a trial by a court-martial the trial judge advocate may, on the application made in this behalf by any accused, direct that each of the accused be tried separately by the same court-martial.