"The traditional jurisdiction to discipline military
personnel has two aspects. The first is an authority to
compel military personnel to conduct themselves in a manner
which is conducive to efficiency and morale of the service;
the second is an authority to punish military personnel who
transgress the ordinary law of the land while acting or
purporting to act as military personnel. These two aspects
of the traditional jurisdiction are reflected in the two
limbs of s. 51(vi). If that sub-section supports a law
creating a military jurisdiction, the jurisdiction has two
aspects: first, to compel members of the armed forces to
conduct themselves in a manner which is conducive to the
efficiency and morale of the forces charged with the
defence of the Commonwealth and of the several States; and
secondly, to control persons who, being part of the armed
forces and acting or purporting to act in that capacity,
transgress the ordinary law of the land or fail to obey the
lawful directions of the Executive Government as to the
activities of the armed forces and the conduct of persons
who are part of the armed forces. This is the disciplinary
jurisdiction which, subject to the requirements of Ch III
..., s. 51(vi) will support."