Psychologically, it must be tough to come back to Canada after being in a war zone where radical Islamic elements are the enemy. Unlike, say WWII, the troops have to come back and face the very thing they faced in Afghanistan on their own soil (like fighting the Germans and then coming back to find people walking around in Nazi uniforms). 

I remember a taxi driver saying to me he pittied the soldiers he drove around because the war was futile. Generally, the population is either clueless or indifferent to what the soldiers are going through.