CAMP PENDLETON, Calif. -- A faster, high-tech seafaring tank for U.S. Marines has hit countless setbacks and cost overruns during the past two decades, and now it is one of the pricier items on the Defense Department's budget-cutting list. Even the Marine Corps' top brass agrees the estimated $12 billion program has to go. But that doesn't mean the debate is over. A group of Republican lawmakers is questioning the Marine Corps leadership's sudden change of heart over the Expeditionary Fighting Vehicle. Generals have long said the amphibious tank under development had come to symbolize the force's very identity and...