30Definitions of service injury and service disease for aggravations etc. of signs and symptoms

30  Definitions of service injury and service disease for aggravations etc. of signs and symptoms   For the purposes of this Act, an injury sustained, or a disease contracted, by a person is a service injury or a service disease if:  (a) the injury or disease:  (i) was sustained or contracted while the person was a member rendering defence service, but did not arise out of that service; or  (ii) was sustained or contracted before the commencement of a period of defence service rendered by the person while a member, but not while the person was rendering defence service; and  (b) in the opinion of the Commission, a sign or symptom of the injury or disease was contributed to in a material degree by, or was aggravated by, any defence service rendered by the person while a member after he or she sustained the injury or contracted the disease. Part 4—When the Commission is prevented from accepting liability for service injuries, diseases and deaths