The country’s first general officer to command American troops in combat since the Second World War, Fraser's most noteworthy role was as brigadier-general during Operation Medusa, which took place in Afghanistan from September 1–17, 2006 as part of NATO’s coalition efforts in the region.

Since retiring from the Canadian Armed Forces in 2011 after 32 years of service, Fraser has worked in the private sector, currently serving as president of AEGIS Six Corporation.

Fraser then worked as director of the Land Force Command Reserve Restructure in Ottawa from 2001 to 2003 and as co-director of the Bi-National Planning Group in Colorado Springs from 2003 to 2005.

Fraser subsequently acted as commandant of the Canadian Forces College in Toronto from 2007 to 2009 and led the Joint Headquarters Renewal Project in 2009 and 2010.

[4] The operation was generally considered successful as it maintained NATO’s credibility within the region and overwhelmed the Taliban forces, which suffered heavy losses.

[6] Then general and Chief of Defence Staff Rick Hillier commented afterward on the toll of the first two days of the operation, underscoring the loss of life.

[10] The efforts of the Canadians and their allies were instrumental in enabling western back Afghan leaders to develop a new constitution, to ensure free and democratic elections, to make it possible for more girls to go to school, and to initiate reform in defence, justice and finance structures within the country.

[4][14] In 2017, Harjit Sajjan, the Minister of National Defence, who had served as the primary liaison between Canadian commanders and local Afghan leaders during the conflict, claimed that he had been the architect of the operation.

[15] Fraser’s first appointment in the private sector was as chief operating officer of Blue Goose Pure Foods, a retailer of organic meats headquartered in Toronto.

Brett Boudreau extolled its clear and accessible account of the battle,[18] while Murray Brewster commented that it spoke volumes with its dignified omission of Harjit Sajjan and the ensuing controversy.

His article in The Dorchester Review stated that Operation Medusa should be "compulsory reading for junior and senior officers, politicians, bureaucrats, and academics.