Squadron Leader Debendra Nath Mukerjee was posted to a communication squadron in October 1966 on completion of conversion training on to a new type of transport aircraft. During training, he was adjudged one of the best pilots in his course. On joining the Squadron, he was instrumental in organising the initial training on the type and its operational trials. He has flown more than 840 hours on the type without a single incident. He has also flown in Northern and Eastern Sectors where he was employed in Air Transport and Supply Dropping missions from 1960 till September 1966. During this time, he flew over 1,500 hours in operational areas. He also flew vital air supply missions during the India-Pakistan conflict in 1965. He has flown about 5,200 hours and has the distinction of having an accident free record. In all the commitments given to Squadron Leader Mukerjee, he has discharged his duties with utmost skill and enthusiasm.

Throughout, Squadron Leader Debendra Nath Mukerjee displayed courage, professional skill and devotion to duty.