WASHINGTON (AP) - The Marine Corps is expected to ask that women not be allowed to compete for several front-line combat jobs, inflaming tensions between Navy and Marine leaders, U.S. officials say. The tentative decision has ignited a debate over whether Navy Secretary Ray Mabus can veto any Marine Corps proposal to prohibit women from serving in certain infantry and reconnaissance positions. And it puts Gen. Joseph Dunford, the Marine Corps commandant who takes over soon as chairman of the Joint Chiefs of Staff, at odds with the other three military services, who are expected to open all of their...