U.S. Marines from the 2nd Marine Expeditionary Brigade, 1st Battalion 5th Marines pass by Afghani villagers in the Nawa district in Afghanistan's Helmand province Saturday, July 4, 2009. Taliban militants attacked a U.S. coalition base in eastern Afghanistan on Saturday with an explosives-laden truck that blew up outside the gates, sparking a two-hour gunbattle and killing two American troops, officials said. (AP Photo/David Guttenfelder)