When war broke out in September 1965, Surinder Kumar Mehra was still with the First Supersonics. The Squadron did not see much action. Relegated initially to CAPs, the squadron did not see much combat during the war, though on one occasion, Mehra missed being bombed by a Pakistani B-57 as he was about to go to his MiG on ORP. In 1967, Surinder Kumar Mehra took over command of No.28 Squadron as its third CO. The Squadron moved to Hashimara in the East. He was awarded the VM for his command of the Squadron. In 1970, Mehra handed over command to BK Bishnoi on a posting to Air Force Staff College in the United States. On returning from the US in 1971, S.K. Mehra moved on to Eastern Air Command's Operational Staff. The 1971 War was spent on the EAC's Planning & Operational Staff. He was commended for some specific non-conventional operations, which are classified. He was awarded the Vayu Sena Medal in 1971.
Surinder Kumar Mehra then went on to command the Tactics & Air Combat Development Establishment (TACDE) which is the cradle of all combat doctrines. He spent three years in command of TACDE from 1973-1976. A stint with the Indian Ambassador's Office in Russia as the Air Attaché followed. He received the AVSM in 1976. On promotion to Air Commodore, he commanded Adampur and later Jamnagar Air Force stations. The senior staffs appointments are held by him at Air HQ include Director of Air Staff Inspection - an organization that assesses and reports on the operational standards of field units, Director of Personnel (Officers), Assistant Chief of Air Staff (Operations), and Deputy Chief of Air Staff. His experience thus represents an ideal blend of personnel management, operational planning, and higher-level futuristic re-equipment planning of the Air Force. As the DCAS, he was fully involved in inter-governmental negotiations and in negotiations with the industry on Air Force acquisitions, as also with the Defence R&D. In 1987, Mehra took over as Air Officer Commanding-in-Chief, South Western Air Command with the responsibility of all air operations in Rajasthan, Gujarat and Maharashtra. In 1988, he took over as the Chief of Air Staff from Air Chief Marshal La Fontaine. His tenure saw the eyeball-to-eyeball confrontation with Pakistan on Operation Brasstacks, the de-induction of the IPKF from Sri Lanka, and acquisition of new systems into the Indian Air Force like the Mi-35 attack helicopters.
Air Chief Marshal Surinder Kumar Mehra retired in 1991, after 40 years of service. During his career with the Air Force, he had accumulated over 3200 hours of flying, and held a PVSM, AVSM and VM for his distinguished services rendered.
Air Chief Marshal Surinder Kumar Mehra passed away on 8th December 2003.