U.S Marines from the 2nd Marine Expeditionary Brigade, 1st Battalion 5th Marines climb on to a rooftop of a house after arriving in an an overnight night air assault near the Taliban stronghold of Nawa in Afghanistan's Helmand province Thursday July 2, 2009. Thousands of U.S. Marines poured from helicopters and armored vehicles into Taliban-controlled villages in southern Afghanistan on Thursday in the first major operation under President Barack Obama's strategy to stabilize the country. (AP Photo/David Guttenfelder)