9/11 Memorial Ruck March
Staff Sgt Mackenzie Donnell, 11th Security Forces Group member, wears a memorial patch during a 9/11 Memorial Ruck March Sept. 11, 2012, at Joint Base Andrews, Md. More than 25 Airmen participated in the three-hour march which stretched a total distance of 9 miles and 11,000 meters around the perimeter of the installation. (U.S. Air Force Photo/Senior Airman Perry Aston)

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