A view of concrete barriers used to divide portions of the stand inside of the massive Bagram Air Field in the Parwan province of Afghanistan January 2, 2015. The base is being shrunk by demolishing large swaths of housing in order to hold roughly 13,000 foreign troops, mostly Americans, who will remain in the country under a new two-year mission named "Resolute Support" to train Afghan troops. REUTERS/Lucas Jackson (AFGHANISTAN - Tags: CIVIL UNREST POLITICS MILITARY)