If the US Army has to keep its flights on published routes in the nation’s capital “secret” and turn off ADS-B (not saying ADS-B would have saved the day here); we’ve already lost the “war”. There’s simply no need for this training—in a national emergency where continuation of government mission is necessary—there won’t be any civilian traffic at DCA. We’re talking 9/11 or nuclear war, not “do you I need to get to the Pentagon for PowerPoint briefing now, CWO”.