Any person subject to this Act who commits any of the following offences, that is to say,--
         (a) is guilty of any disgraceful conduct of a cruel, indecent or unnatural kind; or
         (b) malingers, or feigns, or produces disease or infirmity in himself, or intentionally delays his cure or aggravates his disease or infirmity; or
         (c) with intent to render himself or any other person unfit for service, voluntarily causes hurt to himself or that person;
shall, on conviction by court-martial, be liable to suffer imprisonment for a term which may extend to seven years or such less punishment as is in this Act mentioned.