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.
Ramzi Yousef
The World Trade Center bombing was a terrorist attack that occurred on 26 February 1993, when a car bomb was detonated below Tower One of the World Trade Center in New York City, New York. The 1,500 lb (680 kg) urea nitrate-hydrogen gas enhanced device was intended to knock the North Tower (Tower 1) into the South Tower (Tower 2), to bring both towers down and kill thousands of people. It failed to do so, but killed six civilians and injured 1,042, including 919 civilians (including an EMS worker), 88 firefighters, and 35 police officers.