Sixteen years ago, the building housing the U.S. Department of Defense came under attack. American Airlines Flight 77 was hijacked and crashed into the Pentagon, killing all 59 passengers on board the plane and 125 people working in the building.
Voice of America: Pentagon memorial stands as tribute 16 years after terror attack
An American flag is unfurled on the side of the Pentagon to commemorate the anniversary of the 9/11 terror attacks Sept. 11 in Arlington, Virginia.
