Air Commodore Parkash Singh Devgan was commissioned in the Army Medical Corps in September 1953 and seconded to the Air Force from the same date. He qualified as a paratrooper in 1955 and Commanded two paramedical flights upto 1958.
He was appointed as Commanding Officer No. 9 Air Force Hospital and Senior Medical Officer of a forward Air base during 1974-77 and did pioneering work for the fitness of the aircrew. As Principal Medical Officer of Headquarter Maintenance Command from June 1977-79, he organised effective medical cover and brought down the morbidity rate to the lowest level. The general health and the family welfare activities got an impetus in the Command which was adjudged the best in the Air Force. He was the first Air Force Medical Officer selected to undergo National Defence College course in 1980.