U.S. Air Force Airman 1st Class Charles Chilelli, 633rd Security Forces Squadron member, sprints to a checkpoint during the Security Forces 9/11 Ruck March to Remember in Amherst, Va., Aug. 25, 2011. The march was conducted in remembrance of the 10th anniversary of the terrorist attack on Sept. 11. (U.S. Air Force photo by Tech. Sgt. Barry Loo/Released)