Photos: 9/11 victims honored at Pentagon on 20th anniversary

Ceremonies At The Pentagon Mark 20th Anniversary Of The September 11th Attacks ARLINGTON, VIRGINIA - SEPTEMBER 11: U.S. service members attend the Pentagon 9/11 observance ceremony at the National 9/11 Pentagon Memorial on September 11, 2021 in Arlington, Virginia. The nation is marking the 20th anniversary of the terror attacks of September 11, 2001, when the terrorist group al-Qaeda flew hijacked airplanes into the World Trade Center, Shanksville, PA and the Pentagon, killing nearly 3,000 people. (Photo by Win McNamee/Getty Images) (Win McNamee/Getty Images)