U.S. Marines with Alpha Company, 3rd Combat Engineer Battalion (CEB), remove concertina wire during the demolition of Combat Outpost Ertoba in Musa Qala district, Helmand province, Afghanistan, July 13, 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)