Ghulam Hussain (R) mourns after his son was killed in a Taliban attack in the Ghaziabad district of Kunar province, during a tribute ceremony in Kabul February 24, 2014. The Afghan Taliban killed 21 soldiers in an assault on Sunday in a remote mountainous region, the Afghan government said, and six soldiers were missing after the militants' most deadly assault on the security forces in months. REUTERS/Mohammad Ismail (AFGHANISTAN - Tags: CIVIL UNREST MILITARY POLITICS TPX IMAGES OF THE DAY)