From 1997 to 2000 Vaughn was Chief of the Operations Division at National Guard Bureau , and he was assigned as the Army 's Deputy Director for Military Support to Civil Authorities from 2000 to 2002 . He was on Interstate 395 en route to the Pentagon on the morning of September 11 , 2001 . He observed the hijacked Flight 77 Boeing 757 in flight , parked his car , ran to the building , and took part in the initial response to the casualties and damage caused when the plane crashed into the west side of the building
hijacked Flight 77
American Airlines Flight 77
Clyde A. Vaughn