U.S. Marine Capt. Erin Demchko, right, crosses the

U.S. Marine Capt. Erin Demchko, right, crosses the finish line as the 35th Commandant of the Marine Corps, Gen. James F. Amos, left, encourages participants during the 10K portion of the 38th Marine Corps Marathon in Arlington, Va., Oct. 27, 2013. The Marathon consisted of 23,480 participants routing their way through Arlington, up Rock Creek Parkway, along the monuments and past the Pentagon, finishing at the Marine Corps War Memorial. (U.S. Marine Corps photo by Sgt. Mallory S. VanderSchans/Released)