“One of the things, for the people that are interested in the military, that I asked to look into—the F-35,” President Trump told an audience in Qatar on Thursday, launching into a minutes-long disquisition that left defense officials and aviation experts wondering just what he was talking about.“We’re doing an upgrade, a simple upgrade, but we’re also doing an F-55. I’m going to call it an F-55, and that’s going to be a substantial upgrade, but it