Richard Ragan, left, director of operations for the United Nations Mission for Ebola Emergency Response team, talks with U.S. Marine Corps Maj. Nathan Knowles, right, an engineer assisting Joint Forces Command - United Assistance, about the building of an Ebola treatment Unit in Tubmanburg, Liberia, Oct. 24, 2014. Richard Ragan, left, director of operations for the United Nations Mission for Ebola Emergency Response team, talks with U.S. Marine Corps Maj. Nathan Knowles, right, an engineer assisting Joint Forces Command - United Assistance, about the building of an Ebola treatment Unit in Tubmanburg, Liberia, Oct. 24, 2014. SHARE: Download: Full Size (0.36 MB) Tags: photo essays Credit: VIRIN: 038868-N-OGQ65-482.jpg Photo Gallery