the Commission -
(f) is not bound to act in a formal manner and is
not bound by any rules of evidence, but may
inform itself on any matter in such manner as
it thinks just;
(g) shall act according to substantial justice and
the substantial merits of the case, without
regard to legal form and technicalities; and
(h) without limiting the generality of the
foregoing, shall take into account any
difficulties that, for any reason, lie in the
way of ascertaining the existence of any fact,
matter, cause or circumstance, including any
reason attributable to -
(i) the effects of the passage of time,
including the effect of the passage of
time on the availability of witnesses;
and
(ii) the absence of, or a deficiency in,
relevant official records, including an
absence or deficiency resulting from the
fact that an occurrence that happened
during the service of a veteran, or of
a member of the Defence Force or of a
Peacekeeping Force, as defined by
sub-section 68(1), was not reported to
the appropriate authorities.
...
120. (1) Where a claim under Part II for a pension
in respect of the incapacity from injury or disease
of a veteran, or of the death of a veteran, relates
to the operational service rendered by the veteran,
the Commission shall determine that the injury was
a war-caused injury, that the disease was a
war-caused disease or that the death of the veteran
was war-caused, as the case may be, unless it is
satisfied, beyond reasonable doubt, that there is
no sufficient ground for making that determination.
...
(3) In applying sub-section (1) or (2) in
respect of the incapacity of a person from injury
or disease, or in respect of the death of a person,
related to service rendered by the person, the
Commission shall be satisfied, beyond reasonable
doubt, that there is no sufficient ground for
determining -
(a) that the injury was a war-caused injury
or a defence-caused injury;
(b) that the disease was a war-caused disease
or a defence-caused disease; or
(c) that the death was war-caused or
defence-caused,
as the case may be, if the Commission, after
consideration of the whole of the material before
it, is of the opinion that the material before it
does not raise a reasonable hypothesis connecting
the injury, disease or death with the circumstances
of the particular service rendered by the person.
...
(5) Nothing in the provisions of this
section, or in any other provision of this Act,
shall entitle the Commission to presume that -
...
(b) a disease contracted by a person is a
war-caused disease or a defence-caused
disease; ...
(6) Nothing in the provisions of this
section, or in any other provision of this Act,
shall be taken to impose on -
(a) a claimant or applicant for a pension or
increased pension, or for an allowance or
other benefit, under this Act; or
(b) the Commonwealth, the Department or any
other person in relation to such a claim
or application,
any onus of proving any matter that is, or might
be, relevant to the determination of the claim or
application."