A person subject to this Act who commits an offence of murder against a person not subject to military, naval or air force law, or of culpable homicide not amounting to murder against such a person or of rape in relation to such a person, shall not be deemed to be guilty of an offence against this Act and shall not be tried by a court-martial, unless he commits any of the said offences--
(a) while on active service, or
(b) at any place outside India, or
(c) at a frontier post specified by the Central Government by notification in this behalf
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1 . Explanation omitted by Act 13 of 1975 s ec. 4 .