A display sits in honor of those lost 20 years prior, during a 9/11 memorial ceremony Sept. 11, 2021, at Al Udeid Air Base, Qatar. This 9/11 memorial event marks the 20th anniversary of the attacks to the World Trade Center and the Pentagon, as well as the plane that crashed in Shanksville, Pennsylvania on September 11, 2001. (U.S. Air Force photo by Senior Airman Kylie Barrow)