President Barack Obama's July 2011 date to start withdrawing troops from Afghanistan has given a morale boost to Taliban insurgents, who believe they can wait out NATO forces, the top U.S. Marine said on Tuesday. But General James Conway, who is retiring this fall as commandant of the Marine Corps, said he believed Marines would not be in a position to withdraw from the fight in southern Afghanistan for years. Conway's unusually blunt assessment is likely to fan criticism by opposition Republicans of Obama's war strategy as public opinion of the nine-year-old war sours further. "In some ways, we think...