LUKE AIR FORCE BASE, Ariz.
Airmen assigned to the 56th Fighter Wing pick up ribbons before a ten story stair climb Sept. 11, 2017 at Luke Air Force Base, Ariz. The Airmen climbed and descended ten stories of stairs in the air traffic control tower carrying ribbons that contained the names of those who lost their lives during the terrorist attack. (U.S. Air Force photo/Airman 1st Class Caleb Worpel)