Any person subject to air-force law who without lawful authority discloses or purports to disclose, whether orally, in writing, by signal or by any other means whatsoever, information relating to any matter upon which information would or might be useful to an enemy shall, on conviction by court-martial, be liable to imprisonment for a term not exceeding two years or any less punishment provided by this Act.

It shall be a defence for a person charged with an offence under this section that he did not know and had no reasonable cause to believe that the information disclosed related to a matter upon which information would or might be directly or indirectly useful to an enemy.