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.
List of military operations in the war in Afghanistan (2001–present)
After the September 11, 2001, attacks, investigators rapidly accumulated evidence implicating Osama bin Laden. In a taped statement, bin Laden publicly acknowledged his and al-Qaeda's direct involvement in the 9-11 attacks. In an audiotape posted on a website that the U.S. claims is "frequently used by al-Qaeda", on May 21, 2006, bin Laden said he had personally directed the 19 hijackers.