The Pentagon is bracing for “major upheaval” ahead of President-elect Donald Trump’s second term, according to CNN, with officials already holding informal talks about how the Defense Department will respond if Trump orders it to deploy active-duty military troops on his own citizens and makes good on promises to boot large swaths of workers. Trump insinuated during his campaign he could use the military as a law enforcement mechanism to carry out his plan for mass deportations, and that he would replace government workers with loyalists. CNN reported Friday that the Pentagon is preparing for …