WASHINGTON ― Bringing down sustainment costs for the Lockheed Martin-made F-35 Joint Strike Fighter would be a “top priority” for the nominee to lead U.S. Air Force’s acquisitions, he said Tuesday. Andrew Hunter, a former director of the Pentagon’s Joint Rapid Acquisition Cell and President Joe Biden’s pick for assistant Air Force secretary for acquisition, technology and logistics, told senators he would work at the problem. “The F-35 is an absolutely vital system for the nation and the