The Airmen of “Delta Flight” from the 13th Air Support Operations Squadron pose for a group photo after reaching the capitol building in Washington, D.C., Aug 8, 2013. The “DG” 140 is a 140-mile memorial ruck march from the Casualty Reception Center at Dover Air Force Base, Del., to Maj. David Gray's headstone at Arlington National Cemetery, Aug 4-8, 2013. (U.S. Air Force photo by Senior Airman Carlin Leslie)

More images of the Airmen's 140-mile memorial ruck march below - Click on a thumbnail in Gallery to see larger image