Pentagon Attacked by Plane Crash

394262 02: An injured man gets some help after being taken out of the Pentagon after a plane crashed into the building September 11, 2001 in Arlington, VA. (Photo by Mark Wilson/Getty Images)

A plane crashed into the Pentagon

394262 01: Smoke comes out from the west wing of the Pentagon building September 11, 2001 in Arlington, Va., after a plane crashed into the building and set off a huge explosion. (Photo by Alex Wong/Getty Images)

Plane Attacks Pentagon

394262 02: Paramedics attend to an injured man who was removed from the Pentagon after a plane crashed into the building September 11, 2001 in Arlington, VA. (Photo by Mark Wilson/Getty Images)

A plane crashed into the Pentagon

394262 02: Smoke comes out from the west wing of the Pentagon building September 11, 2001 in Arlington, Va., after a plane crashed into the building and set off a huge explosion. (Photo by Alex Wong/Getty Images)

A plane crashed into the Pentagon

394262 04: Smoke comes out from the Southwest E-ring of the Pentagon building September 11, 2001 in Arlington, Va., after a plane crashed into the building and set off a huge explosion. (Photo by Alex Wong/Getty Images)

A plane crashed into the Pentagon

394262 05: Smoke comes out from the Southwest E-ring of the Pentagon building September 11, 2001 in Arlington, Va., after a plane crashed into the building and set off a huge explosion. (Photo by Alex Wong/Getty Images)

A plane crashed into the Pentagon

394262 06: Smoke comes out from the Southwest E-ring of the Pentagon building September 11, 2001 in Arlington, Va., after a plane crashed into the building and set off a huge explosion. (Photo by Alex Wong/Getty Images)

A plane crashed into the Pentagon

394262 07: Smoke comes out from the Southwest E-ring of the Pentagon building September 11, 2001 in Arlington, Va., after a plane crashed into the building and set off a huge explosion. (Photo by Alex Wong/Getty Images)

Hijacked Jet Crashes into Pentagon

394276 06: The Washington Momument stands in the background as the Pentagon burns after a hijacked plane crashed into the building September 11, 2001 in Washington, DC. (Photo by Greg Whitesell/Getty Images)

Secretary Rumsfeld Tours Pentagon Crash Site

394357 01: U.S. Secretary of Defense Donald H. Rumsfeld (C) leads Sen. Carl Levin (L), D-Mich., and Sen. John Warner (R), R-Va., to the crash scene at the Pentagon heliport September 11, 2001 in Arlington, Virginia. Rumsfeld earlier conducted a news conference with reporters in the Pentagon briefing room on the terrorist attack of the Pentagon. (Photo Courtesy of DOD via Getty Images)

Hijacked Plane Slams Into Pentagon in Terror Attack

394422 01: Military service members salute as fire and rescue workers unfurl a huge American flag September 13, 2001 over the side of the Pentagon in Arliongton, VA during rescue and recovery efforts following the September 11, 2001 terrorist attack. The attack came at approximately 9:40 a.m. as a hijacked commercial airliner, originating from Washington D.C.'s Dulles airport, was flown into the southern side of the building. (Photo byMichael W. Pendergrass /U.S. Navy/Getty Images)

Hijacked Plane Slams Into Pentagon in Terror Attack

394422 02: Smoke and flames rise over the Pentagon late into the night September 11, 2001 following a suspected terrorist crash of a hijacked commercial airliner into the Pentagon in Arlington, VA. The attack came at approximately 9:40 a.m. when a plane originating from Washington D.C.''s Dulles airport, was flown into the southern side of the building. (Photo by Bob Houlihan/U.S. Navy/Getty Images)

Hijacked Plane Slams Into Pentagon in Terror Attack

394422 03: Smoke and flames rise over the Pentagon late into the night September 11, 2001 following a suspected terrorist crash of a hijacked commercial airliner into the Pentagon in Arlington, VA. The attack came at approximately 9:40 a.m. as the plane, originating from Washington D.C.''s Dulles airport, was flown into the southern side of the building. (Photo byBob Houlihan/U.S. Navy/Getty Images)

Hijacked Plane Slams Into Pentagon in Terror Attack

394422 04: A 200-foot gash exposes interior sections of the Pentagon following a suspected terrorist crash of a hijacked commercial airliner into the Pentagon September 11, 2001 in Arlington, VA. The attack came at approximately 9:40 a.m. as the plane, originating from Washington D.C.''s Dulles airport, was flown into the southern side of the building. (Photo by Bob Houlihan/U.S. Navy/Getty Images)

Pentagon Clean Up Continues

394989 01: The portion of the Pentagon that was hit by a hijacked airplane September 11, 2001 is lit up by artificial light as round-the-clock recovery efforts continue September 26, 2001 in Washington D.C. (U.S. Army photo by SSG John Valceanu via Getty Images)

Pentagon Clean Up Continues

394989 02: The portion of the Pentagon that was hit by a hijacked airplane September 11, 2001 is lit up by artificial light as round-the-clock recovery efforts continue September 26, 2001 in Washington D.C. (U.S. Army photo by SSG John Valceanu via Getty Images)

Pentagon Memorial

394989 03: A memorial is erected September 26, 2001 at the Pentagon in Washington D.C. by family members of victims killed during the September 11, 2001 terrorist attack on the facility. (U.S. Army photo by SSG John Valceanu via Getty Images)

Hijacked Jet Crashes into Pentagon

394276 04: The Washington Momument stands in the background as firefighters pour water on a fire at the Pentagon that was caused by a hijacked plane crashing into the building September 11, 2001 in Washington, DC. (Photo by Greg Whitesell/Getty Images)

Hijacked Jet Crashes into Pentagon

394276 01: The Washington Momument stands in the background as firefighters pour water on a fire at the Pentagon that was caused by a hijacked plane crashing into the building September 11, 2001 in Washington, DC. (Photo by Greg Whitesell/Getty Images)

Hijacked Jet Crashes into Pentagon

394276 02: The Washington Momument stands in the background as firefighters pour water on a fire at the Pentagon that was caused by a hijacked plane crashing into the building September 11, 2001 in Washington, DC. (Photo by Greg Whitesell/Getty Images)

Progess Of Pentagon Reconstruction

NEW YORK - SEPTEMBER 12: A satellite image of the Pentagon was taken at 11:46 a.m. EDT September 12, 2001 by the IKONOS satellite over Washington D.C. The image shows extensive damage to the western side and interior rings of the multi-ringed building. Since all airplanes were grounded over the U.S. after the attack, IKONOS was the only commercial high-resolution camera that could take an overhead image at the time. (Photo by Space Imaging/Getty Images)

Smoke And Flames Rise Over The Pentagon

394422 05: Smoke And Flames Rise Over The Pentagon At About 10 A.M. Est September 11, 2001 Following A Suspected Terrorist Crash Of A Hijacked Commercial Airliner Into The South Side Of The Pentagon In Arlington, Va. The Attack Came At Approximately 9:40 A.M. As The Plane, Originating From Washington D.C.'s Dulles Airport, Was Flown Into The Southern Side Of The Building. (Photo By U.S. Navy/Getty Images)

Smoke Rises From The Pentagon After A Terrorist Attack September 11 2001 In Washington D

394996 01: Smoke Rises From The Pentagon After A Terrorist Attack September 11, 2001 In Washington D.C. (U.S. Navy (Photo By U.S. Navy/Getty Images)