MinnPost: Documents reveal extensive planning — and chaotic response — to 2014 downtown military exercises

From the article: On Aug. 18, 2014, an unannounced U.S. Navy training exercise littered the skies over downtown Minneapolis and St. Paul with unmarked helicopters, which snaked among the office towers before hovering above rooftops. Again and again the choppers flew, beginning after dusk that Monday and lasting into the late evening.