Book excerpt: After the terrorist attacks of 9/11, which targeted the heart of financial and military power in the United States, Canada once again proved its credentials as a key American ally. With the imminent end of its combat role in Afghanistan, however, it is time to take stock of how Canada has adapted to the exigencies of the post-9/11 world and to consider the future directions for its foreign, defence, and security policies. This timely exploration and re-assessment of Canada's approach to strategic affairs offers a diverse set of nuanced, sometimes controversial, and always insightful perspectives on the most pressing security challenges that Canada currently faces. Bringing together noted experts on these issues – including a Canadian Senator, a past Minister of National Defence, former high-level military officers, and top scholars - this collection provides powerful ideas and guidance for the difficult task of formulating an overarching national security strategy.