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National Park Service The National Park Service is honored to formally recognize the National 9/11 Pentagon Memorial as an Affiliated Area of the National Park System.As our nation marks 25 years since September 11, 2001, this designation recognizes the enduring national significance of this place of remembrance and honors the 184 people who lost their lives at the Pentagon and aboard American Airlines Flight 77.The two-acre outdoor memorial, which opened in 2008, is a solemn place of reflection and remembrance. The memorial features 184 illuminated units, each dedicated to an individual who was killed on September 11, 2001. Together, they create a lasting tribute to the lives lost and the families, friends, and communities forever changed that day.NPS Photos