Part II of this Act shall, to such extent and subject to such modifications as may be prescribed by regulations made by the Defence Council, apply to persons embarked as passengers on board Her Majesty’s ships or aircraft (not being persons who are subject to air-force law by virtue of any of the foregoing provisions of this Act, or persons who are subject to air-force law or to the M1Naval Discipline Act 1957) as it applies to persons subject to air-force law.