Pentagon officials leading the charge to field as many blast-proof trucks to Iraq as possible face a vexing dilemma -- what to do with scores of Mine Resistant Ambush Protected vehicles purchased last winter that had difficulties in survivability tests this spring. The quandary: Will the Pentagon field MRAP vehicles with known safety problems to troops in Iraq, or will they be kept at home -- even though they might offer much more protection against a roadside bomb attack than...