Remembering September 11th

Joe Foucha, assistant chief of the Niagara Falls Air Reserve Station fire department, rings a bell in remembrance of those who lost their lives during the attacks on 9/11, Niagara Falls, N.Y., Sept. 11, 2017. New York Air National Guardsmen assigned to the 107th Attack Wing and 914th Air Refueling Wing attended the ceremony. Air National Guard photo by Staff Sgt. Ryan Campbell

Guardsmen Remember - Joe Foucha, assistant chief of the Niagara Falls Air Reserve Station fire department, rings a bell in remembrance of those who lost their lives during the attacks on 9/11, Niagara Falls, N.Y., Sept. 11, 2017. New York Air National Guardsmen assigned to the 107th Attack Wing and 914th Air Refueling Wing attended the ceremony. Air National Guard photo by Staff Sgt. Ryan Campbell

Four children in military uniforms stand and salute during a ceremony.

Learning to Honor - Children from an Air Force family mark the anniversary of 9/11 during a retreat ceremony at Al Udeid Air Base, Qatar, Sept. 11, 2017. The ceremony honored those who lost their lives in the Sept. 11, 2001, terrorist attacks. Air Force photo by Staff Sgt. Trevor T. McBride

U.S. leaders render honors during 9/11 ceremony.

Rendering Honors - President Donald J. Trump, right, First Lady Melania Trump, Defense Secretary Jim Mattis, and Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, render honors during the 9/11 Observance Ceremony at the Pentagon, Sept. 11, 2017. DoD photo by Army Sgt. Amber I. Smith

Service members look up to salute an American flag that hands off the roof of the Pentagon.

Pentagon Salute - First Responders salute a large American flag as it's unfurled over the west side of the Pentagon, Sept. 11, 2017. During the Sept. 11, 2001, attacks, 184 people were killed at the Pentagon. DoD photo by Navy Petty Officer 1st Class Dominique A. Pineiro

President Donald J. Trump touches a wreath with his wife beside him and Defense Secretary Jim Mattis and Marine Corps Gen. Joe Dunford behind them.

Wreath Laying - President Donald J. Trump participates in a wreath-laying ceremony at the 9/11 Observance Ceremony at the Pentagon, Sept. 11, 2017. During the Sept. 11, 2001, attacks, 184 people were killed at the Pentagon. DoD photo by Navy Petty Officer 1st Class Dominique A. Pineiro

U.S. leaders take part in the 9/11 remembrance ceremony at the Pentagon.

9/11 Remembrance - President Donald J. Trump speaks during the 9/11 Observance Ceremony at the Pentagon, Sept. 11, 2017. To his left is First Lady Melania Trump, and to his right are Defense Secretary Jim Mattis and Marine Gen. Joe Dunford, chairman of the Joint Chiefs of Staff. DoD photo by Air Force Tech. Sgt. Brigitte N. Brantley

Remembering 9/11 - An entry stone at the Pentagon Memorial lists the names of 184 victims -- 125 Pentagon employees and 59 American Airlines Flight 77 passengers -- who lost their lives during the Sept. 11 terrorist attack on the Pentagon. DoD photo by Army Staff Sgt. Michael J. Carden

Remembering 9/11 - Lights illuminate memorial benches at the National 9/11 Pentagon Memorial, Aug. 24, 2016. The memorial is dedicated to the 184 souls lost in the terrorist attack at the Pentagon on Sept. 11, 2001. DoD photo by EJ Hersom

Service members stand before the American flag draping the Pentagon.

Standing Together - Service members stand after a ceremony at the Pentagon marking the 15th anniversary of the 9/11 attacks, Sept. 11, 2016. DoD photo by Air Force Tech. Sgt. Brigitte N. Brantley

Military and civilian personnel walk down a highway after evacuating the Pentagon.

Remembering 9/11 - Military and civilian personnel evacuate the Pentagon after terrorists hijacked and crashed a commercial airliner into the southwest corner of the building, Sept. 11, 2001. Navy photo by Petty Officer 1st Class Mark D. Faram

Medical personnel load the injured onto an ambulance near the Pentagon.

Remembering 9/11 - Medical personnel load the injured onto an ambulance at a medical triage area following the attack on the Pentagon, Sept. 11, 2001. Navy photo by Petty Officer 1st Class Mark D. Faram

Medical personnel and volunteers work the first medical triage area outside the Pentagon after a hijacked commercial airliner crashed into the southwest corner of the building, Sept. 11, 2001. Navy photo by Petty Officer 1st Class Mark D. Faram

Remembering 9/11 - Medical personnel and volunteers work the first medical triage area outside the Pentagon after a hijacked commercial airliner crashed into the southwest corner of the building, Sept. 11, 2001. Navy photo by Petty Officer 1st Class Mark D. Faram

Wreckage from the hijacked American Airlines FLT 77 sits on the west lawn of the Pentagon while smoke billows from the building.

Remembering 9/11 - Wreckage from the hijacked American Airlines FLT 77 sits on the west lawn of the Pentagon minutes after terrorists crashed the aircraft into southwest corner of the building, Sep. 11, 2001. Navy photo by Petty Officer 1st Class Mark D. Faram

Remembering 9/11 - Smoke pours from the southwest corner of the Pentagon after a hijacked commercial airliner crashed into the building, Sept. 11, 2001. Navy Photo by Petty Officer 1st Class Mark D. Faram

A firefighter instructs rescue teams clearing through debris at ground zero.

Remembering 9/11 - Retired Fire Chief Joseph Curry instructs rescue teams clearing through debris at the site of the destroyed World Trade Center in New York City, Sept. 14, 2001. Navy photo by Petty Officer 1st Class Preston Keres

The American flag is displayed among remnants at ground zero.

Remembering 9/11 - The American flag is a prominent icon in the heart of what was once the World Trade Center in New York City, Sept. 15, 2001. Navy photo by Petty Officer 1st Class Preston Keres

Remembering 9/11 - An aerial view shows the damage and smoke from ground zero where the World Trade Center collapsed following the terrorist attacks, Sept. 17, 2001. Navy photo by Chief Petty Officer Eric J. Tilford

Remembering 9/11 - Smoke continues to waft from ground zero days after the attack on the World Trade Center in New York City, Sept. 19, 2001. Navy photo by Petty Officer 2nd Class Aaron Peterson

Service members and visitors are seen at the 9/11 memorial plaza.

Memorial Plaza Reenlistment - Sailors and Coastguardsmen participate in a joint-service reenlistment and promotion ceremony at the 9/11 Memorial Plaza, New York City, May 26, 2017. One World Trade Center, also known as Freedom Tower, is the tallest building in the Western Hemisphere and was built to honor the victims of the 9/11 terrorist attacks. Marine Corps photo by Lance Cpl. Troy Saunders

People stand at a wall with names on it.

Shanksville Wall - On the eve of the 11th anniversary of the Sept. 11, 2001, terrorist attacks on the United States, people stand at the Flight 93 Memorial Plaza Wall of Names in Shanksville, Pa., Sept. 10, 2012. DoD photo by Navy Petty Officer 1st Class Chad J. McNeeley