The Canadian military will end its mission at Kabul airport on Thursday, as Liberal cabinet minister Maryam Monsef sparked controversy by using the term “brothers” to challenge the Taliban to protect those left behind. Defence Minister Harjit Sajjan said because the U.S. is leading the mission and providing security, its 6,000-strong contingent must be the last to leave the airport on Aug. 31, the American deadline for departure. That means Canada’s special forces and aircrews must begin their departure preparations in advance. Canada is using two C-17 transport planes to airlift Afghans to safety and is one of 13 countries taking part in the airlift. It also has special forces operatives on the ground who are working outside the airport’s confines to spirit fleeing Afghans to waiting flights. “Drawing down a mission takes a considerable amount of time. It is not done overnight, and it comes with considerable risk,” Sajjan …