Airmen from the base Honor Guard fold a U.S. flag during the 9/11 Remembrance Retreat ceremony in front of the 28th Bomb Wing Headquarters at Ellsworth Air Force Base, S.D., Sept. 11, 2013. The ceremony was held to commemorate lives lost in war-time and during the terrorist attack on Sept. 11, 2001. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)