File photo of U.S. Marine Lt. Gen. Allen and U.S. President Obama at event in the East Room of the White House

 
File photo of U.S. Marine Lt. Gen. Allen and U.S. President Obama at event in the East Room of the White House
U.S. Marine Lt. Gen. John Allen shakes hands with U.S. President Barack Obama at an event in the East Room of the White House in this April 28, 2011 file photo during Obama's announcement that then CIA Director Leon Panetta would be nominated as Secretary of Defense. REUTERS/Larry Downing