Staff Sgt. Krystle Harris, a defender with the 31st Security Forces Squadron, is the NCO in charge of the large vehicle inspection station at Aviano Air Base, Italy. Twelve years after the attack, Harris, a Brooklyn, N.Y. native, still remembers the details of 9/11 that propelled her to join the Air Force. (U.S. Air Force photo/Staff Sgt. Evelyn Chavez)