The hijacked airliner that slammed into the Pentagon September 11th caused massive damage to the building and killed 125 people, in addition to the 64 onboard the aircraft. Massive recovery efforts are underway by a variety of governmental agencies that included the 3rd US Army Infantry (the Old Guard) from Fort Myer, Virginia, the Military District of Washington Engineer Company, and the US Army Criminal Investigation Command, Fort Belvoir, Virginia. The Pentagon was the third target of Al-Qaida, a group of fundamentalist Muslims. The others were, the twin towers of the World Trade Center (WTC) and one unknown, when the passengers brought that aircraft down in a Pennsylvania field