Senior Airman Tommy Allgier of “Delta Flight” from the 13th Air Support Operations Squadron, clicks his heels half way in of the final leg of their journey to honor a fallen commander Maj. David Gray, Aug. 8, 2013. The “DG” 140 is a 140-mile memorial ruck march from the Casualty Reception Center at Dover AFB to Maj. Gray’s headstone at Arlington National Cemetery in Virginia, Aug. 4-8. (U.S. Air Force photo/Senior Airman Carlin Leslie)