India continues its indigenously developed Akash air-defense missile system, in anticipation for induction into the armed forces in the near term. As the new missile is fielded, older missiles such as the SA-3 (Pechora) are expected to be retired. Other systems are being upgraded. India will also field the Israeli Spyder missile system, comprised of the Derby and Python 5 missiles operated from a single platform. Other upgrades are provided for older Russian made systems such as the ZSU-23/4 Shilka self propelled anti-aircraft gun. Under a modernization program unveiled at Aero-India, this system is receiving new propulsion, and fire control system, based on an integrated multi-sensor system developed under cooperation between Israel’s IAI/MBT and the Indian company Bharat Dynamics.