(1) A person who intentionally and unlawfully aids and abets or permits the escape of an inmate of war is liable on conviction on indictment to imprisonment for 10 years.
(2) A person who negligently and unlawfully permits the escape of a prisoner of war is liable on conviction on indictment to imprisonment for 2 years.
(3) In this section, “escape” includes the departure by an inmate on parole or beyond the limits within which he or she is allowed to be at large.