Langley Air Force Base Airmen run to a checkpoint during the Security Forces 9/11 Ruck March to Remember in Amherst, Va., Aug. 25, 2011. Airmen from Langley AFB marched 141 miles of the 2,181-mile course originating in Texas and ending in New York Sept. 11. (U.S. Air Force photo by Tech. Sgt. Barry Loo/Released)