FILE -In this Tuesday, Sept. 11, 2001 file photo, Smoke billows from the Pentagon Tuesday, Sept. 11, 2001 after it took a direct hit from an aircraft. The nerve center of the nation’s military burst into flames and a portion of one side of the five-sided structure collapsed when the plane struck in midmorning. One of the trucks, Foam 161, near the center of the photo next to the building, will go on display at the Gen. George S. Patton Museum and Center of Leadership at Fort Knox. (AP Photo/Will Morris, File)