Senior defense officials today said the Pentagon is canceling the Air Force's E-7 Wedgetail program, setting the stage for a possible battle with the chairman of the powerful House Appropriations Committee. A senior military official who briefed reporters on the condition of anonymity today said the program is being canceled because of cost growth and “significant delays” while the Pentagon seeks to address the Boeing-made aircraft’s mission with space-based assets. The official said cost increases range from $588 million to...