Construction begins on the Pentagon. |
Pentagon construction is completed. |
Exactly 60 years after the groundbreaking ceremony for the Pentagon, terrorists hijack American Airlines Flight 77 and crash it into the Pentagon. |
By mid-August, employees whose offices were damaged during the attack begin to move back into the Pentagon.
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The groundbreaking ceremony is held for the Pentagon Memorial. |
On September 11, the Pentagon Memorial is dedicated in a ceremony attended by 20,000 people. |