Mich. Comp. Laws § 32.521
"Line of duty" as used in this act means an act performed by a member of the state military establishment in obedience to or in conformity with a law, rule, regulation, order, command or custom of the military service or an act performed which is not in violation of a law, rule, regulation, order, command or custom of the military service, or that will not bring discredit to the military service. A member of the state military establishment, while on active state service or while attending to military duty required or expected of him or while exercising any personal privilege not prohibited him, by virtue of his status as a member of the military forces, is deemed to be in a line of duty status with respect to an act so done or privilege so exercised, or any happening to him, unless it be shown that such act or happening was on his part in disobedience to some law, rule, regulation, lawful command or order applicable to him, or was the result of his own misconduct. The fact that the member is on leave, pass or furlough status does not preclude an act of, or happening to, the member from being as in line of duty.
MCL 32.521