U.S. Air Force Security Forces Airmen wave to a passerby during the Security Forces 9/11 Ruck March to Remember in Arrington, Va., Aug. 25, 2011. Maj. Jim Alves, 4th Security Forces Squadron commander, proposed the march spanning 2,181 miles across the United States. (U.S. Air Force photo by Tech. Sgt. Barry Loo/Released)