39. Any parson having become subject to this Act by enrolment who is discovered to have made at time of his enrolment a wilfully false answer to any question set forth in the prescribed form of enrolment which was put to him by the enrolling officer before whom he appeared for the purpose of being enrolled shall, on conviction by court martial, be punished with rigorous imprisonment for a term which may extend to five years or with such less punishment as is in this Act mentioned.