Lt Gen PS Rajeshwar was commissioned into the Regiment of Artillery in December 1980. A gunner and aviator, he is an alumnus of the Defence Services Staff College, Army War College and National Defence College(s) in New Delhi and Philippines. He has actively taken part in Operation Meghdoot and Operation Rakshak. He commanded a Medium Regiment in Operation Parakram, an infantry brigade on the Line of Control, a Counter Insurgency Force in Jammu & Kashmir and a Corps in the Desert sector.

He also served on key staff assignments and UN Peacekeeping missions in Mozambique and Rwanda. His apex responsibilities, both tri-service, included the Chief of Integrated Defence Staff to the Chairman Chiefs of Staff Committee (CISC) and the Commander-in Chief of the Andaman & Nicobar Command (CINCAN) from where he retired in May 2020.