Customs exemption extension for defence and internal security imports extends previously scheduled expiry, altering the notification's operative date. Amendment substitutes the operative expiry date in Notification No. 39/96-Customs for the exemption applicable to imports relating to defence and internal security forces, replacing 'August, 2000' with 'August, 2001' in the Explanation to the Table entry at S. No. 15 under powers conferred by the Customs Act.