Joint Chiefs of Staff Chairman Mark Milley on Friday retired with an impassioned speech that took a swipe at former President Trump, proclaiming that the U.S. military does not swear an oath to a “wannabe dictator.” Trump last week accused Milley of “treason” in going behind his back to reassure his Chinese counterpart near the end of his term, suggesting that the Army general should be put to death. “We are unique among the world’s militaries. We don’t take an oath to a country. We don’t take an oath to a tribe. We don’t take an oath to a religion....