U.S. service members listen to remarks by U.S. Air Force Chief Master Sgt. Matthew Norvell, assigned to the 378th Expeditionary Operations Group, during a Remembrance Ceremony Sept. 11, 2021, at Prince Sultan Air Base, Kingdom of Saudi Arabia. Several 9/11 memorial events at PSAB marked 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 courtesy photo by Senior Airman Brianna Alvarez, 378th Expeditionary Maintenance Squadron)