First report from Washington, DC radio station, WTOP, on trouble at the Pentagon. Courtesy of WTOP Radio.

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President George W. Bush, Donald Rumsfeld and others look back on the attack on the Pentagon on September 11, 2001.

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Washington, DC on 9/11, courtesy of WTOP Radio.

With 17.5 miles of corridors and a total floor area of 6.6 million square feet, the Pentagon is a military complex like no other.

At 9:38 a.m. on September 11, 2001, a military cargo plane radios controllers at Reagan National Airport to report that American Airlines Flight 77 has crashed into the Pentagon.

Though blindsided by the attack, Pearl Harbor fighters made a valiant effort to combat the first wave of Japanese planes.