Helping Afghan forces stand on their own, 15 years on

U.S. and coalition forces have been in Afghanistan for 15 years since the 9/11 attacks. Though their numbers have drastically decreased as the U.S. has trained Afghan security forces, it is not easy to build an army in the middle of a war. Special correspondent Jennifer Glasse reports from Kabul on the challenges facing Afghan forces as they try to beat back a resurgent Taliban.