Members of the Nimitz-class aircraft carrier USS George Washington (CVN 73) flag detail listen to a speaker during a 9/11 remembrance ceremony on the ship's floating accommodation facility on Sept. 11, 2017, at Newport News, Va. (MC2 Jessica Gomez/Navy)
Air Force honor guardsmen render a salute during the national anthem sung by Airman 1st Class Heather Bradley, 355th Security Forces Squadron member, during a 9/11 remembrance ceremony at Davis-Monthan Air Force Base, Ariz., Sept. 11, 2017. (Airman 1st Class Giovanni Sims/Air Force)
Master Sgt. Ana Silva, 96th Aircraft Maintenance Squadron, and her 10-year-old daughter, Noemi, stand vigil by the base flag pole flanking 9/11 historical relics Sept. 11, 2017, at Eglin Air Force Base, Fla. Airmen and civilians braved the wind and rain of Hurricane Irma taking turns standing watch during the 24-hour vigil. (Samuel King Jr./Air Force)
U.S. Air Force General Lori Robinson the Commander the North American Aerospace Defense Command and U.S. Northern Command and U.S. Army Lt. Gen. Reynold Hoover, the USNORTHCOM Deputy Commander honor a moment of silence for the victims of the Sept. 11, 2001 attacks during a ceremony in front of the headquarters building on Peterson AFB, Colo., Sept. 11, 2017. (DoD photo by N&NC Public Affairs)
Chief Missile Technician (sel.) Daniel Suderow, assigned to Strategic Weapons Facility Pacific (SWFPAC), talks during a 9/11-remembrance ceremony in front of the Trident Training Facility on Naval Base Kitsap-Bangor on Sept. 11, 2017, in Silverdale, Wash. (MC2 Jacob G. Sisco/Navy)
President Donald Trump greeting family and survivors at the 9-11 Memorial, Pentagon, Sept. 11, 2017. (Daniel Torok/DoD)
U.S. and Canadian military and civilians members of the North American Aerospace Defense Command and U.S. Northern Command salute their respective flags during the singing of both the American and Canadian National Anthems at the beginning of the commands Sept. 11, 2001 memorial ceremony on Peterson AFB, Colo., Sept. 11, 2017. (DoD photo by N&NC Public Affairs)
Mile High Honor Guard members form a firing detail as they show respect to those who gave their lives on 9/11, Sept. 11, 2017, on Buckley Air Force Base, Colo. (Airman 1st Class Holden S. Faul/Air Force)