Lt. Col. Robert Grunewald (pictured in the 9-11 Memorial Chapel) was in the Pentagon when American Airlines Flight 77 struck the building. He knew 31 of the Pentagon staffers who died in the crash.
Rebecca Sheir heads to the Pentagon to talk with Lt. Col. Robert Grunewald, who survived American Airlines Flight 77's crash into the world's largest office building. Grunewald was in an executive meeting when the plane hit his conference room; the two men on either side of him perished. Grunewald shares his story of disaster, heartbreak and, ultimately, hope.
[Music: "Pay Attention" by Bexar Bexar from Haralambos]