Richard Ragan, the director of operations for the United Nations Mission for Ebola Emergency Response, talks with U.S. Marine Corps Maj. Nathan Knowles, an engineer assisting Joint Forces Command - United Assistance, about the progress building an Ebola Treatment Unit in Tubmanburg, Liberia, Oct. 24, 2014. JFC-UA is tasked with assisting the U.S. Agency for International Development in the U.S. government's efforts to end the Ebola virus outbreak in West Africa.