How do you know if a war was worth it? As America and its allies complete their withdrawal from Afghanistan next month, marking the end of a 20-year-war, the Taliban is rapidly retaking its old territory.  So after tens of thousands of civilian casualties, the deaths of 41 Australian soldiers in the field, and billions of dollars in public money to fund the campaign itself, how will history record our involvement? Today on The Signal, we're asking what happens to Afghanistan now the war is over, and what that means for Australia. Featured:  Tyson Sara, former military strategist in the Afghanistan War and CEO, CMAX Advisory