Geof Crossman joined the First Battalion, Princess Patricia's Canadian Light Infantry at Calgary, Alberta in March 1975 . He transferred to the Canadian Airborne Regiment in 1977 and was promoted to Corporal in 1979. Promoted to Master Corporal in 1980, he went with the Airborne to Cyprus the same year. In 1982 he was a member of the Skyhawks Parachute Team in Edmonton and was promoted to Sergeant in 1984. From 1985 to 1988 he was a Parachute Instructor and a Free Fall Instructor at the Canadian Airborne Centre. In 1988 he transferred back to the First Battalion and went with the Battalion to Cyprus in 1990. Promoted to Warrant Officer in 1993 he was posted to Land Forces Central Area in Toronto from 1993 to 1995 and went to Croatia in 1993 as Mortar Platoon Warrant Officer attached to the Second Battalion Battle Group. He transferred to the Second Battalion in Winnipeg, Manitoba in 1995 and went to Croatia as Mortar Platoon Warrant Officer in 1997. He served with the Second Battalion until 1997 when he was posted to the Regimental Museum in Calgary, Alberta as the Assistant Curator. He retired from the Service in 2001.