Langmuir was born in Toronto. He initially planned a military career, and served as a lieutenant in the Canadian Army's Royal Highland Regiment during World War II. He saw service along the Siegfried Line from 1944–1945 until he was seriously wounded in battle February 1945.
Langmuir was born in Toronto. Initially, he had aspirations for a military career and joined the Canadian Army's Royal Highland Regiment as a lieutenant during World War II. He fought on the Siegfried Line from 1944–1945 until he suffered severe injuries in combat in February 1945.