A British aid worker was also killed this year by U.S. special forces trying to rescue her from kidnappers . NEW : Three out of four civilians casualties are caused by insurgents . The Taliban have been fighting the Afghan government for more than a decade, and they're still going strong today. The U.S. and its allies are killing fewer , but insurgents are killing more .
NEW : Three out of four civilians casualties are caused by insurgents . The Taliban have been fighting the Afghan government for more than a decade, and they're still going strong today. The U.S. and its allies are killing fewer , but insurgents are killing more .