One of the largest decisions weighing on the shoulders of prime minister-designate Justin Trudeau is what role, if any, should Canada play in the war against ISIS. And how will Canadians know whether their efforts are having the intended results? Do we really know what our troops are doing in Iraq? Do we even know whether coalition airstrikes are hitting intended targets? Bob McKeown reports from the front lines of Canada's war in Iraq and Syria. Warning: This program contains disturbing images and subject matter. Viewer discretion is advised.