A U.S. soldier keeps watch after an attack at Camp Phoenix in Kabul April 2, 2011. Insurgents clad in burkhas attacked a coalition base in Kabul with guns and rocket-propelled grenades on Saturday, but were killed either when they detonated their explosives or by Afghan or coalition fire outside the entrance, NATO and police said. REUTERS/Ahmad Masood (AFGHANISTAN - Tags: CIVIL UNREST MILITARY POLITICS)