Emmanuel Tucker, center, site engineer, describes

Emmanuel Tucker, center, site engineer, describes construction progress to Sam Sells, left, military liaison for U.S. Agency for International Development, and Maj. Gen. Gary Volesky, right, commander of Joint Force Command – United Assistance, at the site of a new Ebola treatment unit in Zorzor, Liberia, Nov.18, 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)