Flight Lieutenant Harold Clement Demos has been a helicopter pilot since 1963 and has flown over 900 operational hours which involved over 1,000 operational sorties in the forward areas. He has always volunteered for operational missions. He carried out supply dropping missions in Nagaland. In September 1967 when the Nanak Sagar Dam burst causing havoc to the surrounding civilian population, livestock and property, he carried out many sorties under severe and trying conditions. On another occasion, he evacuated 2 casualties at the risk of his own life from an area covered with 15 feet of snow. On 8th April 1968 when an Air Force Officer ejected from an aircraft 30 miles south east of Kanpur and was seriously injured, he disregarding his personal safety, took off from Kanpur in darkness and reached the scene of the accident, picked up the Air Force Officer and brought him safely to Kanpur airfield.

Throughout, Flight Lieutenant Harold Clement Demos displayed courage and devotion to duty in the best traditions of the Indian Air Force.