(1) If the sole or principal use of a carriage service is use by, or on behalf of, a defence organisation to carry communications necessary or desirable for defence purposes, subsections 87(1) and (2) do not apply to the service.
(2) In this section:
"defence organisation" means:
(a) the Defence Department; or
(b) the Australian Defence Force; or
(c) an organisation of a foreign country, so far as the organisation:
(i) has functions corresponding to functions of, or of a part of, the Defence Department or the Australian Defence Force; and
(ii) is authorised by the Commonwealth to operate or train in Australia or an external Territory; or
(d) a part of such an organisation or body.