The focus of the Defense Department inspector general's latest report was whether acting Defense Secretary Pat Shanahan acted ethically, but the document also offered a rare behind-the-scenes look into acquisition decisions made by the Pentagon's most senior officials. Shanahan was cleared in the report, which was released Thursday. The document details the process by which the Pentagon arrived at a controversial decision to procure fewer Lockheed Martin-made F-35s in favor of aircraft made by Boeing and notes that Air Force...