Then-Lt. Col. Darren Jump, left, counsel for environmental and land use with the Office of Counsel for the Commandant, walks alongside a desk being moved into an office in the E Ring at the Pentagon in Arlington, Virginia, in an undated photo from 2002. Jump was one of the first Marines who returned to offices in the E Ring after that part of the Pentagon was renovated following the attacks on 9/11. - Then-Lt. Col. Darren Jump, left, counsel for environmental and land use with the Office of Counsel for the Commandant, walks alongside a desk being moved into an office in the E Ring at the Pentagon in Arlington, Virginia, in an undated photo from 2002. Jump was one of the first Marines who returned to offices in the E Ring after that part of the Pentagon was renovated following the attacks on 9/11.

U.S. Marines run up stairs during a stair walk at the San Diego Convention Center, San Diego, Sept. 11. - U.S. Marines run up stairs during a stair walk at the San Diego Convention Center, San Diego, Sept. 11.

U.S. Marines and Sailors render a salute during a memorial service at Marine Corps Base Camp Pendleton, California, Aug. 21. - U.S. Marines and Sailors render a salute during a memorial service at Marine Corps Base Camp Pendleton, California, Aug. 21.