Airmen, friends, and family gather in front of the Pride Hangar for the 9/11 Ruck March to Remember at Ellsworth Air Force Base, S.D., Sept. 10, 2011. A float that included a piece of steel I-beam from one of the Twin Towers led the procession of marchers on the 10-mile trek. (U.S. Air Force photo by Airman Alystria Maurer/Released)