A "Silver Bullet" airstream trailer (C) carrying U.S. Secretary of Defense Chuck Hagel is pictured inside a U.S. Air Force C-17 aircraft transporting him and his staff from Kabul to Ramstein Airbase in Germany, March 11, 2013. Hagel returned to Washington from his first visit to Afghanistan as Secretary of Defense on Monday. REUTERS/Jason Reed (AFGHANISTAN - Tags: MILITARY POLITICS TRANSPORT TPX IMAGES OF THE DAY)