Carol Han, right, press officer for U.S. Agency for International Development, speaks with Rene' Vega, center, chief medical officer for Heart to Heart International, during a tour of an active Ebola treatment unit built as part of Operation United Assistance in Suakoko, Liberia, Nov. 22, 2014. United Assistance is a Department of Defense operation to provide command and control, logistics, training and engineering support to USAID-led efforts to contain the Ebola virus outbreak in West African nations. (U.S. Army Photo by Sgt. 1st Class Brien Vorhees, 55th Signal Company (Combat Camera) / Released)