Firefighters work to put out the flames moments after a hijacked jetliner crashed into the Pentagon at approximately 0930 on September 11, 2001.

The Pentagon in flames moments after a hijacked jetliner crashed into building at approximately 0930 on September 11, 2001.

Firefighters work to put out the flames moments after a hijacked jetliner crashed into the Pentagon at approximately 0930 on September 11, 2001

Firefighters work to put out the flames moments after a hijacked jetliner crashed into the Pentagon at approximately 0930 on September 11, 2001.

Firefighters work to put out the flames moments after a hijacked jetliner crashed into the Pentagon at approximately 0930 on September 11, 2001.

The Pentagon in flames moments after a hijacked jetliner crashed into building at approximately 0930 on September 11, 2001.

Firefighters work to put out the flames moments after a hijacked jetliner crashed into the Pentagon at approximately 0930 on September 11, 2001.

The Pentagon in flames moments after a hijacked jetliner crashed into building at approximately 0930 on September 11, 2001.

The Pentagon in flames moments after a hijacked jetliner crashed into building at approximately 0930 on September 11, 2001.

Firefighters and Department of Defense employee's organize a group to go in and find survivors moments after a hijacked jetliner crashed into the Pentagon at approximately 0930 on September 11, 2001.

Firefighters work to put out the flames moments after a hijacked jetliner crashed into the Pentagon at approximately 0930 on September 11, 2001.

Firefighters work to put out the flames moments after a hijacked jetliner crashed into the Pentagon at approximately 0930 on September 11, 2001.

Firefighters work to put out the flames moments after a hijacked jetliner crashed into the Pentagon at approximately 0930 on September 11, 2001.

Firefighters work to put out flames moments after a hijacked jetliner crashed into the Pentagon at approximately 0930 on September 11, 2001.

Firefighters work to put out the flames moments after a hijacked jetliner crashed into the Pentagon at approximately 0930 on September 11, 2001.

Firefighters work to put out the flames after a hijacked jetliner crashed into the Pentagon at approximately 0930 on September 11, 2001.

Firefighters struggle to contain the fire, after the September 11, 2001, terrorist attack on the Pentagon. Members of Al-Qaeda, a terrorist group of fundamentalist Muslims, hijacked American Airlines Flight 77, then deliberately impacted the Pentagon, killing all 64 passengers onboard and 125 people on the ground. (U.S. Navy photo by Photographer's Mate First Class Dewitt D. Roseborough III.) (Released)

Firefighters work to put out the flames after a hijacked jetliner crashed into the Pentagon at approximately 0930 on September 11, 2001.

High angle view showing damage to the Western ring wall of the Pentagon Building after the September 11, 2001 attacks.