U.S. Marines with Alpha Company, 3rd Combat Engineer Battalion (CEB), remove sand bags and concertina wire during the demolition of Combat Outpost Ertoba in Musa Qala district, Helmand province, Afghanistan, July 10, 2013. 3rd CEB demolished COP Ertoba in preparation for the retrograde of coalition forces from Afghanistan. (U.S. Marine Corps photo by Cpl. Trent A. Randolph/Released)