He was then posted to the Institute of Aviation Medicine, in Toronto, Ontario, with the diving team.
Knight left for a brief period of time to return to university, and then upon completion, resumed his duties at the institute in 1970.
In 1971, Knight was posted to Air Defence Headquarters as Commanding Surgeon; remaining in the position until 1975, when he was sent on a six-month tour with the United Nations to Egypt.
Shortly after arriving in Halifax, he was transferred to Air Command Winnipeg as Command Surgeon, and remained in the position until 1979, when he was posted to Ottawa to work on the staff of the Surgeon General as Director of Medical Operations and Training.
From 1982 to 1985, Knight was posted to the National Defence Medical Centre (NDMC) as Commandant.