Obama called the Ebola crisis a threat to world security as he ordered up to 3,000 U.S. military personnel to the region along with an aggressive effort to train health care workers and deliver field hospitals. "If the outbreak is not stopped now, we could be looking at hundreds of thousands of people affected, with profound economic, political and security implications for all of us," Obama said after briefings in Atlanta with doctors from the Centers for Disease Control and Prevention and from Emory University, where Brantly and two other aid workers with Ebola have been treated. Obama acted under pressure from regional leaders and international aid organizations who pleaded for a heightened U.S.