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Tactical Air Control Party Airmen from the 13th Air Support Operations Squadron, Ft. Carson, Co. ruck through Gambrills, Md., during a portion of their 140-mile ruck to honor their fallen commander, Maj. David Gray, who was killed in Afghanistan last year, Aug. 7, 2013. The Airmen are marching from Dover Air Force Base, Del., the receiving point for deceased service members killed in war, to Arlington National Cemetery, to Gray’s gravesite. (U.S. Air Force photo/Senior Airman Lauren Main)