U.S Army soldier from Task Force Denali 1-40 CAV shows his tattoo as he stands near a Christmas tree at a clinic at FOB Clark in Khowst province

A U.S Army soldier from Task Force Denali 1-40 CAV shows his tattoo as he stands near a Christmas tree at a clinic at FOB Clark in Khowst province, Afghanistan, December 22 , 2009. REUTERS/Zohra Bensemra (AFGHANISTAN - Tags: CONFLICT MILITARY)