Donald Rumsfeld
The United States was attacked on September 11, 2001 by al Qaeda terrorists who hijacked commercial airliners and crashed them in coordinated strikes into both towers of the World Trade Center in Lower Manhattan, New York City and the Pentagon in Washington, D.C. The fourth plane crashed into a field in Shanksville, Pennsylvania, and its target was likely a prominent building in Washington, D.C., most probably either the Capitol Building or the White House. Within three hours of the start of the first hijacking and two hours after American Airlines Flight 11 struck the World Trade Center, Rumsfeld raised the defense condition signaling of the United States offensive readiness to DEFCON 3, the highest it had been since the Arab-Israeli war in 1973.
Nawaf al-Hazmi
On September 10, 2001, Hazmi, along with Mihdhar and Hanjour checked into a hotel in Herndon, Virginia. The next morning, Hazmi and four other terrorists, boarded American Airlines Flight 77 at Dulles Airport and hijacked the plane so that Hani Hanjour could pilot and crash the plane into the Pentagon as part of the September 11 attacks. The crash killed all 64 passengers aboard the aircraft and 125 in the Pentagon. Hazmi was initially dismissed as a "muscle hijacker" following the attacks, but was later revealed to have played a larger role in the operational planning than previously believed. His younger brother, Salem al-Hazmi, was another of the hijackers aboard the same flight.