The last Canadian troops in Afghanistan were scheduled to withdraw on March 31, 2014. nearly 13 years old, the Afghan mission is the longest-ever in Canadian history, and represents a period of dramatic transformation of Canadian foreign policy and military strategy. That transformation, and the political and economic forces that continue to drive it, is the subject of Empire’s Ally: Canada and the War in Afghanistan, a major contribution to the debate about Canada’s role in the War on Terror and the nature of the deployment.