Lockheed Martin Corporation (NYSE:LMT) shares are trading higher today. The Pentagon will reportedly resume accepting new F-35s next week. As per a report issued Wednesday, the service plans to select the builder of its next fighter jet later this year. Gen. Kenneth Wilsbach, the head of Air Combat Command, said during an event on Wednesday, “Right now we’re very much focused on the TR-3 upgrade, software upgrade, to the [F-35] jet. And as you know, Lockheed Martin had some issues with stability of that software package.” “So we’ve held up signing the jets ...