Mary (McCallum) Barton was a nursing sister in Korea. She lived in Paris and trained as a nurse at the Toronto General Hospital, graduating in 1945. Mary later attended MacGill University where she completed a nursing management program in 1947. She returned to the Toronto General Hospital where she became a supervisor in change of assignments and rotation.

She then enlisted in the Air Force where she began work as a nursing sister and was assigned to the Korean Air Lift. During the Korean War, approximately 60 Canadian Nursing Sisters served in Japan and Korea, providing medical care in combat zones, flying air evacuation missions with casualties, and treating returning prisoners of war after the ceasefire. They treated battle injuries and infectious diseases, working close to the front lines and facing the same dangers as the soldiers they cared for. While only a few Nursing Sisters went to Korea, others served in roles back in Canada, on air ambulances for example. 

When Mary completed her tour in January, 1952, she was stationed in Greenwood, Nova Scotia where she met her husband, Flight Lieutenant George Barton. She and her family moved to various bases in Canada and Europe where her husband was stationed. They moved back to Paris in 1968. She and her husband returned to live at 25 Jane Street after her father passed away in 1983. In Paris she did various volunteer work including for the Lady Lions. She returned to work as a nurse at the Willett Hospital in Paris in the mid 70’s when she retired.