Vice Chief must act as Chief of the Defence Force
(1) The Vice Chief of the Defence Force must act as the Chief of the Defence Force:
(a) during a vacancy in the office of the Chief of the Defence Force; or
(b) during any period, or during all periods, when the Chief of the Defence Force:
(i) is absent from duty; or
(ii) is, for any reason, unable to perform the duties of the office.
Acting Vice Chief of the Defence Force
(2) The Governor - General may, by writing, appoint an officer of an arm of the Defence Force to act as the Vice Chief of the Defence Force:
(a) during a vacancy in the office of the Vice Chief of the Defence Force; or
(b) during any period, or during all periods, when the Vice Chief of the Defence Force:
(i) is absent from duty or from Australia; or
(ii) is, for any reason, unable to perform the duties of the office.