President Barack Obama and Maj. Gen. Jeffrey S. Buchanan of the U.S. Army Military District of Washington, left, lower their heads after the president placed a wreath at the Tomb of the Unknowns at Arlington National Cemetery in Arlington, Va., Monday, Nov. 11, 2013, during a Veterans Day ceremony. Vice President Joe Biden and his wife Jill are at left (AP Photo/Pablo Martinez Monsivais)
{}