A worker decontaminates a caregiver leaving the patient area of an active Ebola treatment center 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 U.S. Agency for International Development-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)