Which is the Defence Satellite of India?

In December 2018, ISRO successfully launched its second advanced defence satellite exclusively for the Indian Airforce, called the GSAT-7 A. It is the 39th Indian communication satellite of ISRO with a mission life of 8 years.

Presently, India has around 15 military-application satellites. In 2022, the $225 million GSAT-7R, an Indian Navy communications satellite will replace GSAT-7 Rukmini launched eight years ago.

Further Readings- 

1. Indian Spacecrafts
2. List of Indian Satellites – (1975-2021)