During the operation against Pakistan, Flight Lieutenant John Leo Dweltz, Flight Commander of a Helicopter Unit, flew twenty five offensive, thirty six logistic, twelve casualty evacuation and four reconnaissance sorties within a period of thirty six days. He operated from improvised helipads in difficult terrain with utter disregard to his personal safety. By casualty evacuation, he saved many valuable lives. His supply dropping missions helped to maintain newly occupied picquets. He continued to operate form helipads within the enemy's shelling range and under constant threat of enemy air raids on his airfield without warning.

On 11th September, 1965, Flight Lieutenant Dweltz was detailed to attack a strong hold of infiltrators at Raman Nallah. While he was bombing and strafing the enemy bunkers in a narrow valley, the infiltrators started firing at his aircraft with small arm fire. Undeterred by the enemy fire, he carried out his mission with determination.

On 15th September, 1965, the army report ed strong enemy pressure on some of our posts in Tithwal area and wanted the Air Force to destroy a rope bridge over the Kishan Ganga. The bridge ran through a narrow valley and the area was occupied by Pakistani infiltrators. Flight Lieutenant Dweltz made three runs over the bridge and dropped forty eight bombs on the target. He set fire to both ends of the bridge and caused damage to its center portion, thus severing the lines of communication of the enemy and relieving pressure on the picquets.