A military helicopter hovers on September 12, 2001, near a breach in the Pentagon created the day before, when hijackers flew American Airlines Flight 77 into the U.S. armed forces headquarters outside Washington, D.C., killing 189 people. (Related: "Team from National Geographic Killed in Pentagon Crash" [September 12, 2001].)

On June 21, 2006, the same section of the Pentagon stands strong, the result of a reconstruction effort that was largely completed by September 11, 2002.

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