U.S. Air Force Senior Airman Nichole Stafford, 633rd Security Forces Squadron desk sergeant, participates in the Security Forces 9/11 Ruck March to Remember in Arrington, Va., Aug. 25, 2011. The march honored the defenders who lost their lives since the start of Operation Enduring Freedom. (U.S. Air Force photo by Tech. Sgt. Barry Loo/Released)