15In section 89(1) of the [1967 c. 80.] Criminal Justice Act 1967 (false written statements tendered in evidence) after the word " Act" there shall be inserted the words " or in proceedings before a court-martial by virtue of the said section 9 as extended by section 12 above or by section 99A of the Army Act 1955 or section 99A of the Air Force Act 1955 ".