Singh was born on 8 July 1934. He was commissioned into the Indian Air Force on 1 April 1956. Selected into the fighter stream of the IAF, he trained as a fighter pilot. In the early years of his career, he served as a Flight Commander in an operational Squadron in the Eastern Sector in 1961-62. He later served as a flying instructor at the Flying Instructors School at Tambaram Air Force Station. He attended the Defence Services Staff College, Wellington in 1968.[2]
During the operations against Pakistan in 1971, Squadron Leader Jasjit Singh flew a number of operational missions over heavily defended enemy areas. In spite of heavy ground opposition he pressed home his attacks and destroyed a number of enemy tanks, gun positions and bunkers. He also supervised the servicing of aircraft and thus ensured maximum serviceability of aircraft for operations.
Throughout, Squadron Leader Jasjit Singh displayed gallantry, professional skill and devotion to duty of a high order.
Post-war career
On 20 January 1975, Singh was appointed commanding officer of No. 17 Squadron IAF. After over two years in command of the squadron, he was promoted to the rank of Group Captain and moved to Air headquarters as the Director (Flight Safety). He subsequently served as the Director (Offensive Operations), and as Director (Air Induction), both at Air HQ.