More than 3,500 U.S. and Philippine marines will launch a two-week war exercise in the northern Philippines this week, with maneuvers including mock beach and artillery assaults, officials said Sunday. The annual exercises begin on Tuesday and involve combat maneuvers on a Philippine marine base, an army special forces camp and an air force gunnery area on northern Luzon island, The Associated Press quoted local navy spokesman Lt. Col. Ariel Caculitan as saying.