This article discusses a group, project, or location which also exists outside the Person of Interest universe.
Its portrayal in the show may differ significantly from its real-world counterpart.
John Reese tells Finch that some members of the United States Military signed up due to family or friends being killed in the Twin Towers of the World Trade Center. (“Mission Creep”)

Reese and Jessica were planning their life together after Reese announced his retirement from the Army when they learned of the WTC attacks on Mexican TV. (“Pilot”)

Finch was working and had ordered that he not be disturbed and hence did not learn of the WTC attacks until Nathan told him later that night. (“One Percent”)

The terrorist attacks on 9/11/01 led to the creation of the Machine.

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