U.S. Air Force Airmen with the 31st Civil Engineer Squadron stand in formation during a 9/11 ceremony Sept. 11, 2015, at Aviano Air Base, Italy. The ceremony was held to commemorate the 14th anniversary of the Sept. 11, 2001 terrorist attacks that claimed the lives of approximately 3,000 innocent people at the World Trade Center, Shanksville, Penn., and the Pentagon. (U.S. Air Force photo by Staff Sgt. Evelyn Chavez/Released)