U.S. Air Force Senior Airman Eric Pulse, 633rd Security Forces Squadron patrolman, carries the guidon during the Security Forces 9/11 Ruck March to Remember in Amherst, Va., Aug. 25, 2011. More than 30 Langley Air Force Base members used an estimated 20 minute mile pace to cover 141 miles in five days. . (U.S. Air Force photo by Airman 1st Class Racheal Watson/Released)