Senior Airman Tommy Allgier of “Delta Flight” from the 13th Air Support Operations Squadron, Fort Carson, Colo., clicks his heels half way in of the final leg of their journey to honor their 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 Air Force Base to Gray’s headstone at Arlington National Cemetery, Aug 4-8. Gray was killed in action outside of combat outpost Fiaz and was posthumously awarded the Bronze Star Medal and Purple Heart. (U.S. Air Force photo by Senior Airman Carlin Leslie)