(1) If the sole use of a network unit is use by, or on behalf of, a defence organisation to carry communications necessary or desirable for defence purposes, section 42 does not apply to the unit.
(2) If:
(a) the principal use of a network unit is use by, or on behalf of, a defence organisation to carry communications necessary or desirable for defence purposes; and
(b) the remaining use of the unit is use by one or more carriers, or by one or more exempt network - users, to supply carriage services and/or content services;
section 42 does not apply to the unit.
(3) 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.