U.S. Air Force Lt. Gen. James Slife, Air Force Special Operations Command commander, holds a piece of the World Trade Center twin towers during a Hurlburt Field 9/11 Memorial Ceremony at Hurlburt Field, Florida, Sept. 11, 2021. Nearly 3,000 people died during the 9/11 terrorist attacks, and there were 1.8 million tons of wreckage. (U.S. Air Force photo by Senior Airman Miranda Mahoney)