(Editor's Note: This story has been updated to reflect comments made by Defense Secretary Ash Carter.) In a significant policy shift, President Obama announced this week that the United States will keep 9,800 troops in Afghanistan through "most of 2016," and will maintain 5,500 troops into 2017. The remaining troops will continue training Afghan security forces and executing counter-al Qaeda missions. "While America's combat mission in Afghanistan may be over, our commitment to Afghanistan and its people endures," Obama...