Lt General J.P. Mathew relinquished the appointment of the Chief of Integrated Defence Staff (CISC) on April 30, 2025 upon the culmination of nearly four decades in service. On the day of his superannuation, he laid a wreath at the National War Memorial, New Delhi and paid homage to the fallen heroes. He was also accorded a ceremonial Tri-Service Guard of Honour at the South Block lawns.

The General Officer had been holding the appointment of CISC since April 2023, promoting jointness and synergy among the three Services. Lt General Mathew has made significant contributions in the expansion of Defence Cyber Agency and Defence Space Agency towards achieving credible capability in these critical domains. He also encouraged deeper collaboration with the Indian defence industry and academia, reflecting the Government's Aatmanirbhar Bharat vision. From steering major reforms and reviewing the curriculum in the Defence Service Staff College of Defence Management, Military Institute of Technology and National Defence Academy to encouraging participation of women, he was instrumental in enhancing diversity and inclusion in the Armed Forces.

In order to maintain defence cooperation with neighbouring countries and promote regional stability & security, Lt General Mathew represented the Indian Armed Forces in various fora. In addition, he was instrumental in enhancing the Armed Forces' Humanitarian Assistance & Disaster Relief capabilities.

Commissioned into the Punjab Regiment in December 1985, the General Officer became the Colonel of the Regiment on January 9, 2022. For his illustrious services, he was conferred with Param Vishisht Seva Medal, Uttam Yudh Seva Medal, Ati Vishisht Seva Medal and Vishisht Seva Medal.